I didn't use any type of sealer when I put mine on and no problem with exhaust leaks after 8500 miles they fit tight.If you follow the directions on this site for the carb rejetting you won't have any problems with that.I didn't remove the air box just modified it and installed a K&N filter so no advice for that from me on that one.Good luck and remember rule #1 if you get agravated walk away for a little bit and have a Guinness
