Hello,

 

Hello,

Sorry about the above heading I screwed up.
I was wondering if anyone is using headman headers with the y-pipe. I bought the set from summit for 320.00 Was there a big difference in performance?

I also would like to know what part number if I were to purchase a NOS set would match my 1991 firebird 305 tbi, and would it be feasible with the 100,000 miles on my car.

Thank you.

 

with 100k on the ticker i wouldent put any no2 on it unless i had a spare motor to fall back on

 

You could run N20 on the LO3 with 100k. People been doing it with 120k even.

Any aftermarket set of exhaust is a heaven to hell comparison to the stock manifolds.