hi, im getting my slp 1 3/4 headers in the mail shortly, just wondering if i should go ahead and have hi flow cats installed also. i think i have a 2.5 inch flowmaster catback, but im not sure. any input?

------------------
91 Z28, 64k mi.,k+ns, chip, flows, fresh black paint, gts blackouts all around, 18" chrome irocs, kybs, eiback 1" springs, global west sfcs, nu stereo/sub/amp, red dome/guage lights, and plenty more to come.

 

The 2.5" Flowmaster hurts you more than does the cat. I'd change to a 3" exhaust before I'd worry about the cat. In my opinion, if you are going to use a cat, just get a new one from catco, its not high flow, but its new, and thus its un-clogged like your OE one is, and thus it will improve performance.

------------------
1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission with 2.77:1 Rear End

Current Mods: LT4 Hot Cam, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Gutted Catalytic Converter, Performance Resource Chip, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, Fully Ported TPI Plenum and Base, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

 

CATCO sells high flow CAT's. I have one that I got from Summit Racing.

------------------
- Mike Harvey -
1986 Firebird S/E