I have asked this several times, but it seems only the people that say "can't do it" reply". i want dual exhaust, non emmissions legal, and I would really like it if whoever has gotten it done, to post how they did it and how they like it. no "well it comes out of two tips at the back" stuff, real life dual exhaust. there will be no cats on it. thanks

 

I don't know if this will help you. I am planning to do the same thing to my car and what I have came up with so far is(I have headers so might be different on your car)If you get some tubing and run individual pipes off the collectors down through where the y-pipe would go and put in an equalizer pipe where the stock cat is(more room there) the continue to run the pipes out towards the rear of the car when you get to the rear axle you may run into a problem with clearance if your pipes are too big(this is where I am having my problems) then you have a few options on how you run it out the back two tips, two tips on one side, etc. I just have not figured out what size pipes to run that will give me good enough flow and be small enough to fit above the axle. I'm thinking so far that 2 1/4 is the biggest and 1 3/4 the smallest could be wrong though. Hangers and such you could fab out of whatever. Sorry if this doesn't help. I'll post a pic if I ever get mine sorted out. But I do know there are a few users here that have done it.

 

I'm in the process of running duals, and its a pain. What you basically have to do is mirror the passenger side on the drivers side which is difficult becaue the driveshaft and torque arm are where the exhaust should be. It will involve a lot of torching hammering and swearing as far as I can tell. The only reason that it is so hard to run duals is because full length headers exit so far back in the car that you can't cross over without going under the trans. If you're running shorty headers then it's a no brainer. If you don't care about exhaust hanging down and ground clearance it's even easier. 2 1/2 in. Pipe works just fine

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'87 Bird 350 .060 over 700R4 + Lots more

[This message has been edited by ATOMonkey (edited July 12, 2001).]

 

Alot of us have dual exhaust and there are many old posts that say exactly how to run it. Me for instance, I used the existing path "no headders" piggy backed down then Y'ed out the back with 32 inch glasspacks this is with 2.5 ID pipe. https://www.thirdgen.org/messgboard/...ML/001569.html
this is Big454blockchevy's thread he did it also. I love this exhaust and would have done it on my fbird also if the shop wasent so chicken.
The reason we dont generaly post is because we get mini flamed and I quote "Why did you do that? a good high flow cat with 4in is much better"
Untrue!
SSC

Forgot about Darcom http://darcom.home.texas.net/

[This message has been edited by SSC (edited July 12, 2001).]

 

i had duals on my '82 maro, was a while ago, lol, but i ran the pipes next to each other for the most part and pippybacked them a lil-ways, ran both pipes off to the back left side of my car. i have an old pic of the backside of the exhaust that kinda shows how its ran but its all dark and hard to see anything on this stupid wintel computer, arg, so i wont waste space with it.

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91 camaro rs w/t-tops, 5sp, open element K&N 14X3, K&N filter top, dual flows, mallory ign, AR 89-92 camaro big block hood w/functional hood scoop and cowl induction, new dark red glittery paint, z-28 grill, z-28 rims, funky circular corvette tail light fiberglass piece and taillights (came with car, ugh), 4th gen front seats, bottom potion of my backseat (not bolted in, just laying there), pioneer 1.5din cd player, blaupunkt 6x9s and 4x6s, some other various mods as well.
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future mods include either a 383 or a big block w/blower, 12 bolt rear, posi, 3.73 gears, trac bars, new rims and tires, even newer 4th gen seats (all of them), all windows tinted, 6sp, 2 12" subs and a good amp (already have a nice custom camaro box), paint the funky circular fiberglass piece!
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previous car was an '82 camaro berlinetta w/sunroof and w/355, 3sp, shift kit, msd ignition, edlebrock performer carb/manifold, dual flows, 14x3 k&n open element, headers, new dark midnight blue paint, 14" grand prix rims and tires, 3.73 gears, posi rear

 

Really what it boils down to is apperance for one and performance for two. Ive got dual 3" on my 87 T/A with the hooker super comp headers. my exhaust comes off the collectors and goes straight back,does NOT follow stock routing, very few small bends and each tube has to be slightly crushed to clear trans crossmember. I had a system that followed stock routing but it had all kinds of bends and to top all that extra restriction off it was 2'5". Ive got 4" of clearance from ground to headers, the rest of the exhaust has about 5-6". The mufflers are hung just in front of the rear end. Oh yeah, I have no tailpipes. More power that way and sounds better. (my opinion, and many other friends have it the same way)My car picked up .3 in the 1/8 just by changing to this setup. Hope this helps

 

I plan on running duals on my 'bird when the time comes. The biggest challenge Ii see so far is getting the pipes over the rear axle. I plan on making my own mufflers (corvette style) since the 'prototype' I have right now is very close to the sound I want.

My main drive for true duals is sound. I've heard so many 3rd gens around where I live & they all sound (IMO) like crap (includig my camaro w/a flowmaster). Single exhaust is single exhaust, no matter ho many outlets you fake having.

Another is I don't want the "you have to look at me because you're annoyed by the sound of my car" exhaust. (hmmmm,,, *****-esque?)

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• my Formula Homepage
• Collision P/Ns & Diagrams (Camaros only, until i get more edited)

The mind is like a parachute, it only works when its open

[This message has been edited by deadbird (edited July 12, 2001).]

 

This is the only "correct" way to run duals. If you're serious about horsepower increases then this is the ONLY way to go.

A full length dual setup with tailpipes would sound good, but actually not make any improvement in power over a single 3". There are simply too many bends. Not to mention the "hey Bubba" sound of glasspacks.

Do it right, and if you want true duals, forget about having tailpipes unless your putting them on a 305 car, which will benefit from a restriction in exhaust flow and make better low RPM torque.

Let the flames begin



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Mike L.
It ain't pretty.......

1987 IROC Z TPI 350 A4 3.27 Borg-Warner.

Mods: 2300-2500 Stall Converter, Shift Kit(GM parts), TPI Specialties Stage 3 PROM, Modified Airbox w/ K&N's, homemade cold air, Relocated MAT sensor, Gutted MAF, 160* thermostat, Accel 8mm Wires, bypassed TB coolant, Flowmaster 3 chamber single 3" in/out muffler, 3" MAC mandrel intermediate, custom dual !cat Y-pipe. airfoil, ported plenum. !smog

http://www.MichaelLasiuta.home.att.net

**BOYCOTT LAPEER DRAGWAY**

 

ok true 2 1/2 duals here with 2 chamber flows. ran down both sides of the car. if you have no ground effects then it looks like the old side pipes. but the g/f on my 92 z hides the pipes pretty good. i have a pic of it on my bird but i dont know how to post it. email me if you want to see. b92z28@aol.com

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92 z28 170,000 miles 14.20 on goodyear eagles before exhaust only mods k&n and slp 13/4 headers and dual 2 1/2 exhaust
87 trans am 12.20 on motor too many mods to list

 

I am willing to bet that putting a 3" single exhaust on there it will pick up at least 10hp and .1 in the 1/4 mile.

Prove me wrong. Nobody has yet when we've compared single vs. duals before.

Ohh, I see...you're from TN

Say Hi to Cooter for me.



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Mike L.
It ain't pretty.......

1987 IROC Z TPI 350 A4 3.27 Borg-Warner.

Mods: 2300-2500 Stall Converter, Shift Kit(GM parts), TPI Specialties Stage 3 PROM, Modified Airbox w/ K&N's, homemade cold air, Relocated MAT sensor, Gutted MAF, 160* thermostat, Accel 8mm Wires, bypassed TB coolant, Flowmaster 3 chamber single 3" in/out muffler, 3" MAC mandrel intermediate, custom dual !cat Y-pipe. airfoil, ported plenum. !smog

http://www.MichaelLasiuta.home.att.net

**BOYCOTT LAPEER DRAGWAY**

 

A true dual exhaust setup is the way to go. No single 3 inch for me!

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383 86 Camaro Z28
10.5:1compression Dart Pro 1 Aluminum heads 215cc>2.05/1.60 valves,400 steel crank,cam specs:224/234 at 050 525/525 lift,2500 stall converter,shift kit,3.42 gears,770 Holley Avenger,Victor Jr. Intake,true dual exh,Hooker headers with 40 series Flowmasters,MSD Coil and Module.

 

i think i have found a way to do it. run 2 2 1/2 inch pipes all the way back in the stock location of the single pipe, then use a crossflow muffler with two inlets and two outlets. are these mufflers considered truel duals though? the exhaust is never consolodated into one pipe through the system except at the muffler where it has 2 inlets and 2 outlets, but i am not sure on how these mufflers work. anyone have any experience on these?

 

that's not considered true duals. The drivers side exaust would be making a longer trip making them unequal to the other side.

 

As I see it, our funky rear suspension is what causes a lot of the problems. Ground clearance is part of this, but if I remember correctly, removal of the torque arm would allow you to run a pipe down either side of the driveshaft. Competition engineering offers a bolt in ladder bar/subframe connector kit. This allows removal of the torque arm. With this setup, I'd try and either have glasspacks along the driveshaft, and slightly crushed 3 inch pipes come out before the rear axle, or try and have a muffler shop negotiate the other side of the panhard rod and put bullet mufflers on either side.

Either way might be too loud, so I'd also try and use some 'resonators' in the system. Not sure about name, but they looked like beat up exhaust pipes with batting doughnuts on them.

 

I use to have dual 2 1/4" pipes both went in stock location,with glasspacks. Currently have single 3" exhaust cause a shop told me that they could put true dual 2 1/2" on it but after they couldn't even redo the old setup I was pretty pissed at them. The 2 1/4" set made so much more power than this sucky single 3" system. Friend has dual 2 1/2" exhaust shop made bracket to lower panhard bar on driver side then ran pipe over top of it. It bottoms a little on big bumps though. Thing is he has supertraps onit. I want to find the quietest possible bullet style muffler for mine. However the dual 3" system above interests me greatly.

Did he run it over the diff or just put down pipes on it and what kind of mufflers did he use?

 

I believe you are referring to moi. I didnt even attempt to run pipes over the rear axle. Why? because it defeated the purpose of having 3" when I had to reduce to 2.5 over the axles. Plus I hate the back cackling sound of tailpipes. Turndowns right off the outlets of my flowmasters.

 

Thanks for the reply I believe thats what I'm going to do for my exhaust that single 3" just has to go car feels so sucked out withit.
Sorry bout not using your name couldn't remember it when I got to reply screen.

[This message has been edited by sb406camaro86 (edited July 19, 2001).]

[This message has been edited by sb406camaro86 (edited July 19, 2001).]