Weird. This one is a TRX5 as well; definitely fits like crap. The head pipe isn't "straight" on the exhaust manifold, and the first bend in the pipe lays against the frame gusset on the inside of the bend (as in the pipe needs to sit a half inch further forward than it does). I've dinked around with it for several hours, and it just is what it is. The main issue is the position of the first bend from the head pipe into the expansion chamber, I'll get a picture when I'm back home again. I've always been a die-hard DynoPort fan, I know the owner and he is completely obsessive compulsive with his pipes; so I'm a little biased I suppose.