I went from my stock setup, to a single out american thunder flowmaster exhuast system, i was wondering what you guys think of a single out exhaust in the terms of power and back pressure. Everytime i hear a third gen with a 80 series flowmaster, i sounds mellow and quiet, but mine is loud as he**.

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Steve
88 Firebird TBI(WS6),TH700R4 - Open Element, Cat Delete, K&N filter 14*4 element, Flowmaster Catback Exhaust, 180 Stant thermostat, Accel cap and rotor

 

I think that your setup is great, but if you even want more sound switch to a true dual straight pipe setup! I have it on my 85 Firebird with a 350 crate motor and Hooker Headers! Now thats a rumble. Just watch out for the cops.

 

what do you guys think? Come on

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Steve
88 Firebird TBI(WS6),TH700R4 - Open Element, Cat Delete, K&N filter 14*4 element, Flowmaster Catback Exhaust, 180 Stant thermostat, Accel cap and rotor

 

A dual outlet exhaust has a nice 'monza' look, I think.. Though I understand straight through flow mufflers are better at scavanging the exhaust than cross flow types like our OE mufflers....

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1986 IROC-Z28 L98 TPI BW WC T-5
Air Foil
K & N
Custom Ram/Cold Air Induction
Koni Gas Shocks
Spohn LCAs and PHrod
Art Houser/Moser 3.73:1 Torsen Diff
Amsoil lubes and oil filter
Flash to Pass feature & 100w Euro lighting
Recaro Driving seat
Hurst Comp + shifter
Random Tech SHF cat

[This message has been edited by Sandy Mandel (edited May 21, 2001).]

 

I think your setup is cool. I think you'll want to go with low restriction cats, but it sound like a nice system

[This message has been edited by 89rsRod (edited May 27, 2001).]

 

Mine goes from the Y-pipe to a 2.75 intermediate to a 3" Flowmaster 3 chamber single outlet muffler to a 4" Stainless tip with a resonator.

Nice mean deep tone rumble at idle and a nice Flowmaster ™ sound at WOT.

I noticed an increase in SOTP after switching from a crossflow 2 chamber.

My next step is a straight thru MagnaFlow or UltraFlow.

In the neverending search for MORE POWER

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Mike L.


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, Relocated MAT sensor, Gutted MAF, Accel 8mm Wires, bypassed TB coolant, Flowmaster 3 chamber single 3" in/out muffler, airfoil, Random Tech Hi-Flow Converter (soon to go byebye!). ALL STOCK otherwise.
http://www.MichaelLasiuta.home.att.net

**BOYCOTT LAPEER DRAGWAY**

[This message has been edited by IROC5.7TPI (edited May 27, 2001).]