under or over diff exhaust.

[AEsuperG]

i have seen a 3 inch over diff exhaust fit. car was maybe 1-1.5 inch lowered. i have had 2 inch and 2.5 inch underdiff exhaust, car was lowered 3 inches, it doesnt hit speed bumps unless you go at it diagonally. the only thing that scrapes is the tip of the muffler backing out of some curbs.

but i really see no big gains in HP with either. unless you can feel 1-2 hp in your stomach when you drive.

oh yea if you do go with underdiff. you need short stroke shocks for the rear. because when you raise the car from the left rear jacking point, the rear end will rest on your exhaust. and in certain road conditions the rearend will come in contact the the piping.