Re-did my drivers side ART pipe since I had an exhaust leak the first time I tried to install them. This time it worked out. After getting the car back up and running I went for a test drive and then a wash. The sound with the ART pipes on the stock exhuast is pretty cool. Can't wait until I finally pull the trigger on an exhaust and complete the setup. The biggest difference in exhaust sound that I noticed was on the downshifts. The trottle blips sound bad a$$ now. I sure it gave some good HP gains as well but not as much as normal due to still having the stock exhuast. The last thing on todays to do list for the Z is to place my the370Z.com stickers.