I just put new exhaust on my truck and was having a few issues. I was wondering if there were adjustments to the engine that needed to be made in order to get the most out of the new set up.

This is a 22re which is bored out .20 over and has the EB 268 cam. Otherwise the engine is basically stock. The exhaust is the stock manifold and down pipe past the 02 sensor, from there it has a magnaflow hi flow cat and 2.25 inch piping with a performance muffler( this is a kit from LC). I was previously
running the stock setup since rebuilding the engine last november.

The two issues I am facing are a more noticeable stutter/rattle especially when at a stop light or sign. If I shift into neutral the rattle is less (automatic tranny). Could this be a idle issue?? Also, so far gas mileage seems to be slighty worse although I haven't calculated it exactly. I know "winter" gas produces worst mpg but are we using "winter", less ethanol fuel yet?

I know alot of you run 2.25 piping so i was wondering what I can do to get the best performance from it.

Thanks!!! JIM