I'm currently building my replacement for my 305 TPI for my '86 Z. I already have a 3" borla catback, but need to know if changing to dual cat's is worth it performance/dollar wise. I got enough $$$ floating in my motor as is, but I need to decide on my replacement choice on the cat and I will be buying headers soon. I know they exist, who even sells those headers? Trying to go for 450HP on motor, realistically 400-420. Any suggestions are appreciated. FYI: I am not using air injection. Thanks

 

Forgot my sig, in case it helps. Oops...
WOO-HOO! 400 posts! Don't I get a card or something? =)
------------------
Current project:
1986 IROC-Z28 Camaro
Formerly a 305TPI auto, MOTOR BLOWN due to bad fuel injector
Lakewood LCA's and Panhard rod, 4thgen disc rear with 3.42 Torsen, aluminum DS, T-56 transmission, 4thgen leather seats. SS ZR-1 wheels and P275-45-ZR17 Eagle F1's, SFC's and STB.Soon; 4thgen ABS, dash, and console.
IN THE WORKS: 350 TPI, TRW forged pistons, balanced GM bottom end with ARP fasteners and Fluidampr, high-pressure pump, TPiS ZZ9 cam, TFS 23* aluminum heads, Edelbrock TPI base with ported SLP runners and 58mm TB, 30# Accel injectors, 150HP nitrous 'wet' kit, MSD-6AL, 1.5 RR arms, SLP 1 3/4 headers, all the little bolt-ons

[This message has been edited by dhirocz (edited August 30, 2001).]