These work well on 400 -500ci engines and support 1200hp each. One I bought used (very low usage) but looks brand new and the other I bought new. I only ran the car very slowly (160mph) and never made any more than 3psi of boost with testing runs at Ohio Mile. The have 1.08 AR exhaust housings. Also, I have an extra .96 ex housing that goes with them.
I am stepping up to GT4718s aka 4788 for my new AA engine in the Carbiliner.
Asking $2900 for the pair.
