im planning on putting headers on my car soon. what i have now is just a flowmaster muffler(does anyone know how to tell which flowmaster it is?). anyway, should i look into putting dual 3" intermediate cat back exhausts, or would it just be the same if i changed the intermediate pipe into 3"? if i should change into dual cats, what should i be looking for?

dozer80464@aol.com

 

I switched to a dual cat y-pipe with the cats removed and bypassed.

Made a big difference on the @ss dyno




------------------
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**

 

I'd say just go with a single high flow cat and a 3" cat back system.