Me and my 2 buddies just completed the isntall of my Steeda UDP's and Steeda T/A. I no i've heard many stories bout not gettin any power blah blah blah, I feel a big diffrence especially low end. I felt a diffrence with the UDP's with timin set at tad more than 10. Motor winds up much quicker it seems, Then went to gas station and put in some 93 Octane and bumped timing to 15-16 degrees, and the car idles great (8-900 rpms) Runs great no bucking or anything and pulls good. I feel just as good gains as i did with my O/R midpipe, I would love to get to a dyno. I guess every car is diffrence some say no gains others say good gains. I say good gains