Ok so I asked before for any suggestions on fuel additives and have been using the Power Service grey bottle, 16 oz.'s and 8 oz's of 2 stroke oil with every fill-up, I run it down to about 1/4 to 1/8 tank every week, right away I noticed it running quieter and it was even a little cooler towing the racecar last weekend, though the temps are a little cooler outside, so no real data to compare that one with. My question now is Exhaust. I've been looking into SS's 4 inch turbo back kit. Thinking about splurging on the stainless kit, anybody else use this one in particular, or have any suggestions on a comparable kit? Any help is appreciated.