Yes, the donuts for the crossover worked fine, I apologize, I was referring to the downpipe flange. It leaks like a sieve at the gap in the clamp. I am now wondering if this leak is causing fuel calc errors in my fast box (it indicated 13.8 AF where my old Zirconia O2..which is before the leak shows its fat, not sure of the AF, but it sits richer than where I was in PE with chips and the stock ECM)