I have a '91 Z28 with a 305 which has a
2 1/4" cat. SLP has a 3" cat adapter, a 4 bolt adapter, and a LG4 adapter. I have my headers already but I didn't get an adapter because I don't know which one fits. So which one works? Is there any other way to make it fit? Should I just buy a new 3" cat? Also do I need new spark plug wires that have all 90 degree boots? I have also heard that I should buy a shield for my starter what do you guys think? What times do you think I will run?(time in signature)

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'91 Z28 305, Auto trans, K&N filters, power pulleys, ported plenum, hypertech chip, hooker cat back, kyb shocks, STB, 14.7@ 93 mph.

 

What size is your hooker cat-back, if its three inch, just get yourself a new cat and order the three in adapter, or call slp and ask them. You will need 90 degree boots for all the wires. Good luck getting a heatshield around the starter without taking it off.

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1986 Trans Am
305 TPI
"If it's not one thing, it's another!"
http://www2.hanover.edu/hierlmeier

 

I agree, why go though all the trouble of getting them on to choke them into a 2 1/2 opening.