I have an 87 GTA 305 tpi. I'm thinking of investing in a pair of headers, it already has flowmaster, and i just want a pair that are going to connect to the stock y-pipe. I was wondering if you guys could tell me which ones would fit best last longest and show the most performance gains.

 

Not sure of any that connect to stock y but for the best headers as far as lasting, power gains and quality its SLP all the way, get their 1 5/8" set for your car, check the GP section there is a rolling GP on them still i believe.