Hello,

I had some similar problems on a car with a full exhaust. The tubing was not welded to the end of the reducer. The tubing was inserted past the reducer end over an inch. This caused a bunch of back pressure that only showed up for me at the track. Intake leaks, dipstick pushed up, ballooned up pan, leaks etc. This was a fresh motor also. Do you have a full exhaust?

Damon