I don't know if someone already went over this or not. If there is a thread and I didn't see it, maybe you could point me in the right direction. I have a 87 firebird with a 350 swap. I installed a set of Hooker headers (2460-1hkr). They are 3 bolt flange and 3" collector diameter. I already previously installed an exhaust system. Basically I'm looking for the best fitting Y-pipe (no cats) for these headers. And if it matters I have a stock oil pan. Thank you

 

Doug's D3320 headers and D901 y-pipe are the same as Hooker 2460 headers and Hooker 16767 y-pipe, but it looks like the Hooker y-pipe has been discontinued, probably because it was horribly constructed. Most people use Doug's y-pipe with the Hooker headers because it's about $100 cheaper than Hooker's y-pipe was. I haven't used the combo, but reviews on Jegs and posts with pictures here on TGO confirm that they fit together.

 

Yep, i use the D901 y-pipe with my hooker 2460s