theres been alot of talk about header size and everyone wanting dual custom exhaust, and i am intersted in both. what i want to know is some opinions on which do you think is better true duals or a big single, like 3 inch or so. ok let me re phrase that, do you think the trouble of duals is worth the perfromance gain over single exhaust. i have seem some pretty fast LT1 and LS1 cars running single exhaust, however i am not sure on how large the pipe was. i am putting a 400 in my bird, and have decided to do with 1 5/8 long tubes, next i am trying to decide if i should try to have true duels ran, or have a y pipe made into one 3in or 3.5in exhaust pipe. thanks for any opinons.

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Wide Open Till You See God...Then Brake

[This message has been edited by LilJayV10 (edited August 09, 2001).]

 

If u can find someone in your area who can do the duals go for it. If no than I would recommend a single 3.5" or 4" from mufflex.
I got a 400 in my car with a single 3" which I'm not too impressed with as the car orginal had dual 2 1/4" and some shop messed it up when trying to put dual 2.5" in. The car just doesn't feel the same any more. So I'm going with the 4" system.


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406SBC
-DART SPORTSMAN 2 HEADS
-RPM INTAKE
-750 SPEED DEMON MECH SEC. CARB
-HEDMAN HEADERS
-COMP CAM EX .507/.510

 

If youre going with a 400 with long tubes...why not get the 1-3/4 primaries? I am a full believer in true duals. Ive got dual 3" and love it. It sounds much better than single exhaust. It picked my car up about .6 in the 1/8. A buddy of mine put it on his 95 z-28 and it picked his car up about the same. If single exhaust is so good, why dont corvettes, mustangs, and all these guys who have fast cars use it?

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1987 GTA 355 inch motor, carbureted, TFS 23* heads, T-56 6-speed, McLeod clutch, 11.3:1, Lunati hydraulic roller .510/.525 lift 232/242 duration @.050 on a 112* lobe seperation, Hooker super comps, Dual 3" flowmaster 2-chamber exhaust with NO tailpipes, 98 Z-28 wheels, Strange 12-bolt rear w/4.30 gears, 33 spline axles and a spool.
This car is driven on average 100 miles weekly... ...Whatever turns your tires.....

 

For our cars I'll say single.

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89 RS

STILL Looking For:
An 87 IROC-Z28 350 TPI




[This message has been edited by IROCZTWENTYGR8 (edited August 10, 2001).]

 

Depends on how much your engine is putting out... My new engine is going to require dual 3 inch Thank goodness spintech mufflers are small

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'82 Z28
LG4 305 .030 over, performer intake, holley street avenger 670, xe 256 cam, tes headers, 3 inch single exhaust, spintech muffler, 14 x 3 inch drop base k&n.

 

Damn, I think me and Twistedwedge are from the same planet- the hate wimpy exhaust planet. Thats a good example, Twistedwedge, over a half second improvemant - with a real exhaust system - Thats what I'm saying! Dont give up free horsepower!

I personally dont think its a matter of single vs. dual, but a matter of the right size pipe. You need to size the exhaust for the power level of your engine. If you have 400hp you should be running 1 3/4" headers with a single 3.5" or dual 2.5" pipes - or bigger!

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91 B4C 305 TPI - SOON TO BE 383
TREMEC 5-SP, STOCK 1-BOLT REAREAND w/342 GEARS, K&N, AIRFOIL
EDELBROCK HEADERS, DUAL CAT TO HOMEMADE Y-PIPE & 3.5" SINGLE PIPE W/ FLOWMASTER, CRANK PULLEY, MSD, FUEL PRESS REG, COWL HOOD, WELD WHEELS
14.1@ 98MPH
-------------
OTHER RIDE
67 CAMARO - STREET CAR, BIG BLOCK, PUMP GAS
350TH w/ATI 10", 12-BOLT w/373 GEARS
10.94@124.13 ON MOTOR - ET-STREETs w/MUFFLERS

 

How many problems are there with clearance, I want dual 2.5" into borla mufflers, but where would they fit the mufflers??? is there any body work that the shop has to do.... any one have pics of there setup on a hoist.???

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1989 GTA 350 TPI
Stock:
- T-tops
- Dual cats
- 9-Bolt 7.75" Rearend
- 3.27 gears
Mods:
- Dynomax Super Turbo Muffler

1992 RS 305 TBI - Sold

 

Single 3 or 4".

Its the only "correct" exhaust for a 3rd gen.

If you have an all out race car, then 3" dumped at the axle is adequate.

I'm so sick of this topic....It seems to come up once a month.


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Mike L.

The Weapon of Choice:
1987 IROC Z 5.7 TPI A4 3.27 Borg-Warner four wheel disc
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, MSD 6A, 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, few others I forgot...???

**BOYCOTT LAPEER DRAGWAY**

 

i know this topic has been hashed out over and over again. to answer someones question earlier, my setup is as follows
400 SBC
441 double hump heads 2.02 1.60, port matched, bowl hogged, 274xtreme cam
1 5/8 headers, dual 2.5 exhaust or single 3in(which ever i decide)
700R4, trans go shift kit, better clutches, sun gear, vette plantetary, and all that stuff
3.42 or 3.73 gear

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Wide Open Till You See God...Then Brake

[This message has been edited by LilJayV10 (edited August 10, 2001).]

 

A true dual exhuast setup is the way to go. NO SINGLE EXHUAST 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,3500 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.

 

True duels it tuff o a third gen.To close to the fuel line.And not emmisions legal,hot converter near floor pan is not a nice.About the best system to use is Mufflexs Ypipe that uses the hooker longtubes,this is the best setup for a high output motor.Forget the true duels.Let this topic die already

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Check out my Hompage,or the beginnings of one.355 dynoed at 400HP at 5800RPM & 410LBFT of TQ,on Motorhttp://www.procharged89z.cz28.com/index.html

 

dynomax makes headers for a small block in f-bodies that are 2 1/4" @ the collector run that to your cross over then to a 3"dia pipe down the shaft then split it @ the rear. cheap and easy..

 

If the guy asks about single and dual exhuast he deserves an answer. True duals is the way to go(LIke it or Not!)

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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,3500 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.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.