All I did was replace the entire Nismo exhaust. I added the Meisterschaft full cat-back system (Y Pipe, Cat-Back-Mid Pipe & the rear mufflers). I do not own a video camera.......hmmm, but I might have to get one from Best Buy possibly. I'm not exactly sure about the exact power gains. GTHAUS says with their Meisterschaft full cat-back system you are looking at anywhere from 20-30hp gain. GTHAUS says you will not get the full 20-30hp gain once the full cat-back is on, but probably after 120-150 miles. I'm assuming it is like if one went with a CAI that you will have to put probably 100-150 miles before getting the possible maximum hp gain. If one has the full cat-back system & CAI, then a Tune will be definitely beneficial to pick-up any loss hp with the two.
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