i am now even more sure of the stronger "off the line" WITHOUT my downpipe. but its in the first 1-2 seconds of takeoff, after that, it doesnt matter. i have noticed a better tip-in from a stop, at least .5s less delay. .5s isnt much, but im being cautious in my numbers. i feel the difference for sure, no more waiting ~1 second for it to move. my downpipe came out last night for some fun testing. at first i figure ill end up wanting my downpipe back in. but i have had some killer pulls today which starts me second guessing. not so much the power difference as a feeling difference. everything is tighter up thru 6500rpms. lost traction more than usual at redline in a couple gears. i like the quieter drive also. I do have an intake, and that is what i have not really tried much before, a stage 1 + intake. Very fun setup.