Bracket Man

HI

I have 82 with headman headers and single
exhaust no converter two half inch pipe
to flow master. I have strong bracket
350 and want to dual out. I have seen
many bad dual systems. I was thinking of
two small flow masters at converter area
and two dual pipes to rear. What have you
done. Member 228 said 3 inch duals? HELP

IROC5.7TPI

Please trust me here when I say this:

You don't need true duals. A 3" or 3 1/2" single setup will be plenty. It will provide excellent ground clearance, as well as good fit and sound.

Sorry, this topic burns my @ss.



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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**

3.1 firebird

go with 2.5" true duals. I have read a few books written by experts who recomend true duals "for every performace V8".The only problem is getting it installed. Our cars were designed to accomodate a wimpy single exhaust. BTW , duals sound MUCH better than any single exhaust Ive heard.

IROC5.7TPI

Just because a book was published with that recommendation does not make it right.

And just cause you can read doesn't make you know any better than the next guy.

Big454blockchevy

Go with the true duals. It is not that complicated to get it done. The only reason I can think of for you not to go with a true dual setup WITHOUT converters is cuz of emmissions but if you can pull it off go for it! I would recommend the 40 series Flowmasters.

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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.

Bracket Man

Hi,

I installed shorty headman headers when
I installed heavy 350. I had a custom
head pipe made at muffler shop to single
exhaust system. Now I have purchased head
man headpipe so dual pipes come around
the corner at converter location. I have
two small flowmaster mufflers to hook up
in the converter area. They do not fit to well, but I could possibly weld together
custom plumb. Sandwitch together two exhaust
pipes to rear. I love the sound of chevelle
at track with bb and dual flowmasters. I want
ground clearance as I drive on street. I have big round round cam and need high rpm
torque. Single big pipe will breath cam,but
sounds bad. What have youall done

twistedwedge

Dual 3" here, ran them straight back basically, no tailpipes. I think it sounds much better than single exhaust!

------------------
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.....

3.1 firebird

perhaps you should write your own book. You seem to know everything.

When did I say that? I just simply posted I;ve read where experts(who happen to own this thing called a dyno) have found dual exhaust produces better power.

unknown_host

iTrader: (1)

Know what pisses me off? you stupid people that are convinced dual exhaust sucks. you are stupid. there are three reasons not to have dual exhaust:
1- you want to lower your car
2- you have to pass emmissions-
3- you are stupid and think that having all of your exhaust converge into one big pipe is better than having two seperate moderate pipes.

i am going to have to make the decision here soon, but i need ground clearance so i dont know. the bottom line- if you want horsepower get dual exhaust. i have yet to see a dual exhaust person recommend getting single exhaust for performance reasons. also, if you want better proof than a book, how come all the dyno software in the world adds horsepower for dual exhaust setups? and stop bashin v6's, they are 3rd gens like the rest of us. i personally think any engine that came stock in a thirdgen is crap, minus a couple rarities like turbo trans ams, so if you think you are all high and mighty with your mid 200 horsepower 350, realize that new v6 camaros have almost as much horsepower as your car did stock. the keyword here is respect.

91-ZZ4-Z28

True duel exhaust is not a bad idea but the fact is that to make any more power than a large single pipe you have to have several things. One you must have smooth bends, two you need an x or h pipe to equalize pressure, and three you must have an exit point that does not dump your exhaust under the passenger compartment (unless it is a pure race car with no long term driving). I have never seen a quality system with good fit and finish for our cars that does this if you can find one let me know. Back in the early 90's supertrapp had a duel setup for our cars but it made less power than most 3in. systems so they stopped making it.

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1991 Z28 ZZ4 with LPE superram base, SLP runners, LPE 58mm T-body,Random Technology ramair,TES headers,24#svo injectors,ZEX nitrous,Walbro 255lph f-pump,Accel AFPR,Random Technology catback,!cats,and mutch more.