Mike Harvey

I was thinking that since I am going to totally redo my entire exhaust w/ the headers I was thinking why don't I try to take advantage of the idea of a true dual exhuast. On the rebuild next year it will only help it, ya know?
I was thinking of getting another FlowMaster 80 series, another CATCO high flow CAT, and an X-pipe. Does this sound right & do I need anything else?
My main question was of clearance problems. Do I have the room? Would the the mufflers drop down too far & what are the differences between the V8's w/ true duals and my V6 w/ a single in and dual out exhaust out the muffler? Thanx

- Mike Harvey -

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The '86 Firebird http://www.geocities.com/flash_point2002

Black Beauty

well it is Possible but not plausible....people have done it but the mufflers and rest of the exhaust wont like speed bumps, driveways, dips, rocks, potholes, shoes, soda cans, curbs....jk....they pretty much cause clearance problems....some have run both tubes down where the single tube goes...but your cramped for space. good luck though

gsmann

i have true duals with the two pipes going where the single pipe used to go. it's all tucked higher than the stock piping and i have never scraped anything yet. it was one of the best things i did to my car. other than putting in a 350 instead of 305.

Ehelmsin

I wanted them too... from what I have read on all the posts, if you just have some put on, you will have clearence problems. But if you put a good deal of effort into it, duals can be done, but it is a lot of planning and work. But most importantly, it isn't really the best way to do exhaust... the only real disadvantage (Assuming your main pipe has a decent diameter) of the stock system design is the exhaust has to travel different lengths to reach the y-pipe. Thats what I have gotten from all the posts on this topic, but I could be wrong.
(Sorry about my crappy spelling!)

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'89 Iroc-Z
350 TPI
No mods... yet!

theformula

Unless your running around 500hp why would you do such a ridiculous thing. It will hurt your performance. You need the backpressure.

If you need that much flow go with a Mufflex 4" exhaust system.

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91 Formula
305 TPI 5speed
1LE/G92/WS6
Custom cold air intake w/K&N, SLP airfoil, ported plenum, TB coolant bypass,Crane AFPR (47psi),94 octane,Crane Extruded Alum. 1.6 full roller rockers, Timing set from 4*BTDC to 10*BTDC,MSD6AL, Holley 9mm Annihilator Laser shot 50 wires, Ac Delco cap,rotor and plugs, Bosch O2sensor, SLP 1 5/8 headers,SLP catback,3:73s,JET 195* fan switch, Macewen white face gauges, Intellitronix Digital Gauges

Stock throttle body, runners,intake manifold,cam, and heads.

jrr

I noticed you're in California. In some smog stations, putting in true duals will fail the inspection simply because the car came with ONE cat. The EPA goons get very **** in some places (not all) if you replace the one cat with two duals in parallel.

Go by your local smog station and find out if going to a true dual exhaust is kosher where you are.

Get Blown ?

If you want to do it visit this site and have something similar mocked up. http://www.geocities.com/norine.geo/Exhaust.html

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1989 Camaro RS LO3 WCT5 "The Hose Queen" 0-60' 2.34 1/4 15.8@87mph
http://350.StreetRacing.org

3.1 firebird

I bet your car sounds good with that duel exhaust.

Kenn

Thats the best Dual Exhaust installation I ever seen on a third gen - looks like Steve didn't have to make an body mods either- I wish there was more info on it

3inch duals might be a little big for his 350ci/475HP - but still a great install

sven86berlinetta

I'm buying true 2.5 inch duals for my car in a couple of months. They are on another 86 Berlinetta right now. He did lose a lot of ground clearance, but it is nothing too bad.

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Luke
94 Saturn SL (1.9L)
86 Camaro Berlinetta (5.0L) *TPI 350 In Progress*
Berlinetta Board Mod @3rdgen.org
Non-Tech Mod @LG4 Performance Team

Get Blown ?

That's not my true duals. Wish it was. Never-the-less the pictures and basic info on that page should help inspire your local muffler shop.

Basett Racing

I used to have a pretty unique dual setup on my 82 Z, it consisted of Hedman shortys, and 2.5" pipe using 2.5"ID X 36" long Dynomax Turbo Tubes. The exhaust ran down from the headers, and turned out about 8" the turned back vertically. I had the Turbo Tubes mounted in the "trough" between the floorpan and where the rocker panels are pinch welded. They are have a 3"OD and fit perfectly into the "trough". After the muffler, they ran about another foot then turned down slightly. The car was pretty mellow in idling/normal driving situations, but they really howled under accelleration. Before I ever heard this set-up, i was afraid it would have the ragged, 70's Ford truck, poppy "cherry bomb" glasspack sound, but it was not at all poppy and it sounded wicked!
I painted the whole exhaust system w/ VHT flat black header paint. It had better ground clearance that the factory exhaust due to them being tucked under the car in the "troughs". If you have a car w/ ground FX, e.g. Z28,IROC, RS, the exhaust isn't even visible, but when I painted my car, I took off the ground FX, and you could see the exhaust. It was a pretty clean set-up, but now I have upgraded to 3" all the way back to one-chamber Flowmasters, since the car only sees limited street use. I am planning this setup my 89 RS. Just another suggestion.
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82 Z28 350, Ported #882 Heads, Performer RPM cam and intake, hedman headers,650 Demon carb,
Trans: Turbo 350 w/ 4000 stall -- Rearend 7.5 w/ Richmond 4.10's, Auburn Minispool
Future plans: Dart headed, Roller cammed 383 in early '01


89 RS, L03 305, Hypertech Chip,cat delete, Dynomax exhaust,K&N open element Filter,160 stat, MSD coil --Trans:700R4 Corvette Servo -- Rearend: 7.5 GM 3.42 w/ posi-lock http://www.bassettracing.cz28.com

Mike Harvey

Right on!!!!!! The Camaro looks sick as hell. What I'm wondering is if it would be too much to do it to a V6. What kind of back pressure does that engine need & such? So would it be worth while or not? THanx

- Mike Harvey -

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The '86 Firebird http://www.geocities.com/flash_point2002

junkyarddog

mike,you know deep down in your heart you want a V8,what are going for duals for?

Mike Harvey

What do you mean I want a V8, hell, before my Firebird I had a '93 Firebird Formula that was just unreal. It had mads amounts of HP & torque. I bought it at a dealer only auction when I was 19 and it had all the time slips & dyno #'s w/ all the work done on it. With all the work done to it I think that there was more stuff done to it than what was listed. The HP & torque were both close to 400 HP. I had to get rid of it b/c I was paying $380 a month on insurance & that is w/ a clean driving record. Jeez my payments were only $220 but I will get another V8 one day. I'm thinking about a 4th gen Firebird or maybe pre smogged Camaro or T/A. But currently I am concentrating on my car; to me it is a challenge on trying to get this car to go really fast.

- Mike Harvey -

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The '86 Firebird http://www.geocities.com/flash_point2002

Basett Racing

I think as far backpressure goes you'll be OK. since there is almost a 90 degree bend to the outside of the car. I can tell you I got my LG4 305 in the 8.90's (1/8 mile) with this set-up. I picked up 2 tenths changing from a Flowmaster 2.5" in / dual 2.5" out crossflow muffler to this system.

Matt Finch

I was just wondering but would that be a stock LG4? If so, than I know your full of it! I can't even break 10.2 with my 305 and I have spent Quite a fair penny trying to get it to go! Just for curiosity's sake, what has been done to this 305?
Thanks!


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Matthew Finch

88blkiroc

OMG those pics of that exhaust gave me a stiffy.

Supercharged85

3,000 dollars, damn i paid 300 for mine.