i guess you want a loud exhaust. i am not sure but the all are loud if you cut out spark arrestors. my buddy has a 2007 ltr450 and he has a yoshimura pipe on it. it sounds great! he paid like $800.00 American dollars for a full system. he loves it. i am not sure if they make a fat boy exhaust for a ltr450 they are loud. ugly loud! i know they make them for honda. another good exhaust is curtis sparks thats what i have on my honda 400ex. sounds good and its pretty loud with out the spark arrestor in it. get a dirt wheels magazine and it will have adds for different brands and look them up on the net. GOOD LUCK hope you find what you want.