MSMS3 pretty much covered most of it, I too "had" the TurboXS stealthback DP/RP set up with stock CBE. I didn't find that it was too loud at all, only when under WOT did I feel it was "LOUD." It is a PITA getting to all of the stud bolts. My 02 sensors came out OK but I've seen and heard others complain about removing them. Took about 3 hours initially with me plus 2 and a lift. When I went back to my stock DP/MP it took me over 4 hours. I was also getting boost cut at WOT on the freeway in 4th-5th gears. Which will lead you to more mods (and money) to get rid of this condition. I found it really annoying hitting boost cut, no fun. Seemed to happen more in cold weather for me. You will probably want to do a 02 sensor cheater fix if you don't want a CEL. Since the TurboXS already has an extended bung I opted to do the diode cheater fix and never saw a CEL for the 5 months I ran this set up. Looks like your in CA. too, so keep in mind your now going to have an illegal set up on your car. I know several people in my area, (Northern CA. S.F. bay area) who have been busted for illegal emissions modifications. Costs a lot of $$$ in fines and you have to put the car back to stock for a state referee inspection and smog check. The local Police and CHP are out in force now looking for us. They will and do enforce these laws and won't hesitate to pop your hood or look under your car if they suspect somethings modded. Not trying to dissuade you in your decision just a basic heads up... This is a mod that you will see some real good gains with especially if you've already opened up your air intake side (SRI, CAI, TIP...) Oh one more thing I had, since you wanted both sides (negative/positive.) I noticed the smell of fumes too, not having cats will do that. I only noticed it at idle and at stop lights but it's definitely there. Some are more bothered by this than others. I guess I'm a bit sensitive to it...