I just wanted to pass on to anyone with a 05 WR450 my experience with the TT AIS removal kit. After a little bit of studying, I tackled the job. Instructions were pretty good. The only difficult part was getting the metal plug into the port near the exhaust. I loosened up the radiator on the front brake lever side, squeezed a 8" long 1/2" socket wrench extention and used it to tap the plug in firmly. The plastic plug that went into the top of the carb boot was a tight fit, but I was able to twist it into place with a pair of needle nose pliars in about 1 minute. Total job time for me was probably about an hour, but I like to take my time. The best news is that the exhaust popping during deceleration completely dissappeared! to the TT AIS Removal kit!