masterbator, You claim to be some kind of expert. But your coming across the wrong way. I personally think you have too much time on your hands and you're using your Google search function way too much, to gather information to make it seem like you know what you're talking about. Once you've been in business as long as TNT has and gained some actual knowledge and experience, please come back and post. I for one was there when some tuning on this pipe was done back to back with a power factor pipe, it makes more POWER period. With that being said this will be on my to buy list. O yea they come with a money back performance guarantee, who else offers one of those?