i'm taking my car to the dyno on monday. currently i have the factory h-pipe with the cats cut off. i was wondering if it would be beneficial to put on my offroad bassani x-pipe. i like the sound of it now and i'm not sure how the x-pipe will sound but if it frees up some extra hp then i'm game. also, anything i need to do/check on the car before i go. i got a tune up about a year ago and they are putting on a new fuel filter right before my dyno tune. one last thing, they mentioned using a diablo chip to tune my car. did they make a diablo compatible with my 97? sorry for all the questions.