Just curious, how did you "disable" the back-pressure transducer? Thomas Fox 93 NX2000 "John A. Heer" <jheer@walterhav.com> wrote: <snip> SOLUTION: First, we installed 2 thick gaskets and bent the cat and B-pipe flanges so that they would seat more closely (no leaks). Next, we ended up disabling the back-pressure transducer so that the EGR would function almost perfectly.