fiream

I need help. I maybe getting the exhaust done next week. Headers and all. I have put up a picture of what my exhaust may look like, Dual inlet/outlet cat, two glasspacks and out the back. I'm think of maybe using another muffler, other then glasspacks and flowmasters. I'm thinking about going with a Dynomax mufflers, but I don't know which one. Any suggestions are well come. I've seen the website about the dual exhaust fbodies, post by Tas. I am think about instead of having the muflers in the middle of my system to moving them to the end of my system like a Jaguar XKR, Corvette, or RiceBoys. To get the most amount of tourqe out of the system. I will go with 2" pipes and cat. and what ever muffler I end up picking. I don't know what do you think? I am open to any and all comments, question, or what ever you have to say about this thread. I will enclose the pic and link to my exhaust system on my website.

Thank you for your comments and questions and what ever in advance,
Robert

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------------------
Chevy 2.8L 60° V6
Mods:
?K&N Filter Lid
?87 Formula Hood
?Bosch Platinum +4
?Hi-Flo CatCo CAT
?Flowmaster 80 Series Muffler
?83 Trans Am 15x7 Turbo Fin Wheels
?B.F.Goodrich Radial T/A 225/60-15
?Chevy 2.8L Heddman Headers (Going on soon)

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[This message has been edited by fiream (edited November 07, 2001).]

fiream

what r u guys anti-V6 or something???

------------------
Chevy 2.8L 60° V6
Mods:
?K&N Filter Lid
?87 Formula Hood
?Bosch Platinum +4
?Hi-Flo CatCo CAT
?Flowmaster 80 Series Muffler
?83 Trans Am 15x7 Turbo Fin Wheels
?B.F.Goodrich Radial T/A 225/60-15
?Chevy 2.8L Heddman Headers (Going on soon)

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Tas

don't waste your money. Just get a stock replacement 2.75" system from dynomax. Tell them you have a TPI 350.

------------------
-Tas
'89 Formula WS-6

305, TBI, 700R4, P.A.W. 14x3 open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips, Hooker 1-5/8" 50 state legal headers, Dynomax 3" I pipe (PN 44063 and 43248)
Super GRK_Taz World
F-Body Dual Exaust
EFI & Intake Options

Tom84L69

Edelbrock offers a true dual system but it is expensive. It's also for V8s. Come to think of it, you really don't need true duals. I like the above idea about getting a big single.

cort351w

Go for the true dual setup. I am putting mine on this weekend. Won't be too easy, though--I got a bunch of hooker mandrel u-bends from summit and I am going to cut and weld and make it work.

fiream

good luck

crucial

Dual exhaust with cherrybombs... You're lucky nobody said anything BAD about it yet. You know it's gonna sound like *** on a V6 right ?

------------------
1991 Z28 5.7 TPI

ZZ4 heads, ZZ4 cam, Harland Sharp roller rockers, Accel base, SLP siamesed runners, 52MM SLP Throttle Body, Hooker Headers, Flowmaster catback, MSD6A ignition, Home made ramair system, aluminum driveshaft, WC 5-speed etc

1QWIKZ

Do yourself a favor and get the single 3" from dynomax. I wouldn't waste my time putting a true dual setup for a v-6, just my opinion.

fiream

I;m thinking about not using the cherrybombs, instead I'm thinking about using two Dynomax Ultra Flo SS mufflers at the very end of my system, so the car won't loose to much tourqe.

------------------
Chevy 2.8L 60° V6
Mods:
?K&N Filter Lid
?87 Formula Hood
?Bosch Platinum +4
?Hi-Flo CatCo CAT
?Flowmaster 80 Series Muffler
?83 Trans Am 15x7 Turbo Fin Wheels
?B.F.Goodrich Radial T/A 225/60-15
?Chevy 2.8L Heddman Headers (Going on soon)

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Timmys88Z

dude its a 6 cylinder.....think about what you're saying here...

fiream

Yeah but after i'm done modifing it it's going to have around 300-325hp so I will need the dual setup anyways.

------------------
Chevy 2.8L 60° V6
Mods:
?K&N Filter Lid
?87 Formula Hood
?Bosch Platinum +4
?Hi-Flo CatCo CAT
?Flowmaster 80 Series Muffler
?83 Trans Am 15x7 Turbo Fin Wheels
?B.F.Goodrich Radial T/A 225/60-15
?Chevy 2.8L Heddman Headers (Going on soon)

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Team FTS

Go with a 3" single exhaust it flows about the same as true dual 2" and thats enough flow even with your predicted 300-325 hp and it's less headaches.

------------------
Silly mustang's speed is for F-bodies

F-BIRD'88

A nice 2 into 1, back into 2. system, say with 2.5" head pipes merged into a 3" main pipe and then a 3" in dual 2.5" out muffler will easily support 325 hp. I did the custom mandrel bend, welded front to back, Twin Turbo 2.5" "true dual" thingie, and got the T-shirt. It works well, has good ground clearance,(modified crossmember) but was hours of work, cutting, fitting and welding. I've got over $400 (CAN) into mine and I did 80% of the work myself. Next time I'm going to do the 2 into 1 deal. It's fits a lot better, makes the same power, and is a lot cheaper. Even custom made. The important thing is the "Y" pipe. Some of the aftermarket kits are just a cheap "T" connection. Do some more research
before you commit yourself to "trueduals"
Look into a custom made Merging Y pipe and 1 big a** cat. Then U will have lots of cash left over for that built, Killer V6 from HELL! Like cyinderheads, cam, forced induction, and NOS etc.
Good Luck.....

[This message has been edited by F-BIRD'88 (edited November 10, 2001).]

Big454blockchevy

A 2" true dual exhaust has MORE flow than a 3"single. Think about it.


------------------
383 86 Camaro Z28 ---1/4 mile e.t&gt;12.89@108.8mph,,
10.5:1compression Dart Pro 1 Aluminum heads 215cc&gt;2.05/1.60 valves,400 steel crank,cam specs:224/234 at 050 525/525 lift,3500 stall converter,shift kit,4.10 gears,770 Holley Avenger,Victor Jr. Intake,true dual exh,Hooker headers with 40 series Flowmasters,MSD Coil and Module.ALSO SECOND GEN Z28---mods:454 BBC,.546 max lift(doug herbert cam ) 750 Holley vac sec. ,Edelbrock Performer manifold,Holley electric fuel pump,Hooker headers,Flowmaster mufflers,beefed up 700r4 tranny, 3.90 gears, powertrax unit, B&M console shifter.

fiream

I think 2" duals will flow better then a 3" single because 2" duals are equal to a 4" single. But I am wondering what mufflers to use. I have a flowmaster right now, But I don't like the way it sounds. The only reason I have it is because myfriend gave it to me for free. I had a cherry bomb on the car once, and I liked the sound, it was real mellow had a pretty good tone. Now i'm thinking about going with a Dynomax Ultra Flo SS one on each side of the car under the bumper, or one Dynomax Ultra Flo SS dual inlet/outlet on one side, What Do you think, any suggestions?

thanks,
Robert

------------------
Chevy 2.8L 60° V6
Mods:
?K&N Filter Lid
?87 Formula Hood
?Bosch Platinum +4
?Hi-Flo CatCo CAT
?Flowmaster 80 Series Muffler
?83 Trans Am 15x7 Turbo Fin Wheels
?B.F.Goodrich Radial T/A 225/60-15
?Chevy 2.8L Heddman Headers (Going on soon)

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F-BIRD'88

1 3" diameter pipe has an area of 7.06 sq in.

2 2" pipes have a combined area of 6.28 sq. in.

1 3" pipe will flow more air than 2 2" pipes

and support more HP....

[This message has been edited by F-BIRD'88 (edited November 10, 2001).]

fiream

how did you get the numbers?


------------------
Chevy 2.8L 60° V6
Mods:
?K&N Filter Lid
?87 Formula Hood
?Bosch Platinum +4
?Hi-Flo CatCo CAT
?Flowmaster 80 Series Muffler
?83 Trans Am 15x7 Turbo Fin Wheels
?B.F.Goodrich Radial T/A 225/60-15
?Chevy 2.8L Heddman Headers (Going on soon)

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a = <FONT FACE='SYMBOL'>P</FONT>r<SUP>2</SUP>

Big454blockchevy

I stand corrected , my mistake. But Dual 2.25 do flow more than single 3 ". Now a 2.5 would flow 39.2699 compared to a 3"Single which flows 28.2743

Big454blockchevy

In area square inche that is.

[This message has been edited by Big454blockchevy (edited November 10, 2001).]

[This message has been edited by Big454blockchevy (edited November 10, 2001).]

fiream

so let me get this right

area=3.14 X Radius of the pipe squared

Is this right?


------------------
Chevy 2.8L 60° V6
Mods:
?K&N Filter Lid
?87 Formula Hood
?Bosch Platinum +4
?Hi-Flo CatCo CAT
?Flowmaster 80 Series Muffler
?83 Trans Am 15x7 Turbo Fin Wheels
?B.F.Goodrich Radial T/A 225/60-15
?Chevy 2.8L Heddman Headers (Going on soon)

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F-BIRD'88

A single 3.5" to 3.75" will cover
the needs of just about any streetable motor,
and cost less and fit better than any 2.5"
dual system. You can even fit a 5" main pipe thru the rear if ya really want to get silly. Like I said in a previous post I've been this route and got the T-shirt on this one. There is good reason why none of the factory or aftermarket stuff are dual. It isn't worth it. A big single pipe fits, and
provides all the flow nessessary on this car.
I can see running twin head pipes back to twin converters under the passenger floor pan.
But from here it's better to join the two pipes into a big common pipe to go over the axle and throu the rear suspension. From there you can run dual mufflers and tail pipes or one big muffler with either one big tail pipe or two smaller ones. Dual exhaust
is not even the most optimum setup for a V8
Look at a Ferrari or Formula 1 V8 car exhaust. Its a 180 deg header with 2 into one exhaust collector. If you just got to have dual exhaust on a thirdgen go ahead but
it is a big waste of time and money for nothing in my opinion.

[This message has been edited by F-BIRD'88 (edited November 11, 2001).]

Big454blockchevy

Well , opinions vary but the numbers are there for you to see. A 3.5 flows 38.4845 compared to a 2.5" which flows 39.2699. Are you getting the picture now. NOW if you go with 3" duals you've got some good flowing at 56.5487. In MY OPINION DUALS IS THE WAY TO GO. For serious horsepower that is.

------------------
383 86 Camaro Z28 ---1/4 mile e.t&gt;12.89@108.8mph,,
10.5:1compression Dart Pro 1 Aluminum heads 215cc&gt;2.05/1.60 valves,400 steel crank,cam specs:224/234 at 050 525/525 lift,3500 stall converter,shift kit,4.10 gears,770 Holley Avenger,Victor Jr. Intake,true dual exh,Hooker headers with 40 series Flowmasters,MSD Coil and Module.ALSO SECOND GEN Z28---mods:454 BBC,.546 max lift(doug herbert cam ) 750 Holley vac sec. ,Edelbrock Performer manifold,Holley electric fuel pump,Hooker headers,Flowmaster mufflers,beefed up 700r4 tranny, 3.90 gears, powertrax unit, B&M console shifter.

F-BIRD'88

You got your formula wrong A = 3.1416x radius squared. radius is 1/2 of diameter.

And twin 2.5" pipe will not make a V6 faster
or better than a single 3.5" pipe
Even a Big Block would be hard pressed to Max out a 4" to 5" single pipe which will fit the car better than any 2.5" to 3" dual system. All you would acomplish is emptying your wallet.

Big454blockchevy

I am not just talking about a v6 . I am talking about v8s also. Buddy like it or not duals is the way to go! For serious hp that is.

------------------
383 86 Camaro Z28 ---1/4 mile e.t&gt;12.89@108.8mph,,
10.5:1compression Dart Pro 1 Aluminum heads 215cc&gt;2.05/1.60 valves,400 steel crank,cam specs:224/234 at 050 525/525 lift,3500 stall converter,shift kit,4.10 gears,770 Holley Avenger,Victor Jr. Intake,true dual exh,Hooker headers with 40 series Flowmasters,MSD Coil and Module.ALSO SECOND GEN Z28---mods:454 BBC,.546 max lift(doug herbert cam ) 750 Holley vac sec. ,Edelbrock Performer manifold,Holley electric fuel pump,Hooker headers,Flowmaster mufflers,beefed up 700r4 tranny, 3.90 gears, powertrax unit, B&M console shifter.

Big454blockchevy

Now tell me you don't agree a 2.5 dual pipes on a v8 flow more than a 3.5 single. And yes 3" duals outflow a 3.5 .

Big454blockchevy

Now about installing a 4" or 5 " on a thirdgen I just don't know. How about a 6" single?

cort351w

fiream, if you're going with glass packs because of clearance issues, look at my reply on the post CHECK OUT THIS PICTURE (nagga). I list 7 or 8 different mufflers that are of comparable size to glass packs.

fiream

DO those mufflers your talking about sound good?


------------------
Chevy 2.8L 60° V6
Mods:
?K&N Filter Lid
?87 Formula Hood
?Bosch Platinum +4
?Hi-Flo CatCo CAT
?Flowmaster 80 Series Muffler
?83 Trans Am 15x7 Turbo Fin Wheels
?B.F.Goodrich Radial T/A 225/60-15
?Chevy 2.8L Heddman Headers (Going on soon)

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cort351w

I have never heard any of them that I know of. But, considering that the Stainless Specialties and the hooker mufflers I mentioned are made for hot rods, where looks/sound is often more important than performance, I'd bet that they sound good. Having said that, I told stainless specialties what I have and what I want to do and they said that their 4" diameter mufflers would provide excellent flow. They told me about an muffler comparison (can't remember the magazine that did it) that was done a little while ago in which the Stainless Specialties 4" diameter mufflers (they have a name, but I forgot what it is) came out on top. Real specific , I know.

Hooker said that their elite stainless and original header muffler (the 2 have the exact same insides) flow comparable to Borla turbo mufflers, which are part of Borla's XR-1 race series and are supposed to be good for engines with up to 475 hp.

Do a search for Dynomax bullets and you should get plenty of results. They are as straight through as they come--very little power loss; very little noise reduction--and only $40.00 each in jeg's or summit.

As for the others, I can't tell you a thing. Do a search for them on google or something. I can usually find something that way.

Hope this helped you.

arthur

What I think needs to be mentioned here, is that larger is not always better. Just as the intake system, and the header system, the exhaust tube need to be 'tuned' to size. Has anyone ever seen a 6 inch, single barrel carburator? Exactly my point. When the exhaust valve opens, a sound 'shockwave' is transmitted through the exhaust to the exiting tip. It is then reflected back through the system, and meets the oncoming (exiting) exhaust.(This is also how the Flowmasters work!) Where this meets, and how it meets is all part of exhaust tuning. When the exhaust tube becomes too large, it's like putting a big cushion in the system. The exhaust flow would be hindered by the turbulence created in the large tubes. In a dual situation, the same properties that everyone uses in headers applies. The smaller area allows the flow to stablize, as well as having better scavenging characteristics. It does have more surface area in the duals, but that's part of teh design. I will also say that pipes or headers that have rust inside, will rreduce performance through more turbulated exhaust due to the friction it creates. So the coated headers and stainless/rustproof systems are the way to go. So to sum up, if you stick with a single, don't go overboard on the size, and if ultimate TQ/HP is your goal, the go dual. But only if your patience, and wallet allow it...

IDSA- inner diameter surface area

SINGLE SYSTEM:
3" IDSA-9.42"
3" AREA-7.07" sq
3.5" IDSA-11"
3.5" AREA-9.62" sq
4" IDSA-12.57"
4" AREA-12.57" sq
5" IDSA-15.71"
5" AREA-19.93" sq
(A little large!)

DUALS:
*-numbers are doubled to compare

2" IDSA-12.57"
2" AREA-6.28" sq
2.5" IDSA-15.71"
2.5" AREA-9.82" sq
3" IDSA-18.85"
3" AREA-14.14" sq

It should also be noted that with a dual setup, there will be almost twice as much scavenging effect, which will increase flow.