I picked up 3/4 and 1/2 I will determine the best tommorow. I wasn't banking on the 1's being the best but got them anyways just in case.

 

Which headers did you get? I mentioned the bolts that ship with the headers i suggested were gonna be the wrong thread size.... and all the headers ha e tight clearances for bolts including the old pacesetters I had...

 

Got them installed today using 5/16 by 1 or 3/4s. No leaks at the heads however the dame collecters on my magnaflow cat assembly (all in one with the Y pipe) were just too small and they leak like a sieve. I may need toget an exhaust shop to plumb it better. They would sound great if they didn't leak like all hell. And yes Auggie the clearences were incresubly tight.