On one of the mac forums.mac suggested increasing the fuel pressure when installing long tubes but didn't go on to expalin how or why.
Des anyone have any insight to this subject?Clue me in please

 

That doesnt make much sense in the fact that most LT equipped cars I have seen usually go rich on the a/f ratio. If anything, leave it stock untill you can get the car dyno'd and/or tuned by someone who can adjust it all via the ecu.

 

yeah that sounds weird. my car runs really rich since i had the free flowing exhaust put on. but part of thats is no cats....oops