I am thinking about switching from a Yoshimura Comp system to a new exhaust. My 3 choices are MBRP, Sparks, and Duncan's Fat Boy 4. I have read alot about the MBRP and Sparks pipes, but nothing at all about the FB4. Any info or opinions would be much appreciated. BTW, I will be using it mostly for XC racing and trail riding. Thanks!

RR1

 

i dont have any personal experiences with it but 1 of my friends has it and loves it. i have heard many good things about it in magazines.

 

MBRP is unproven in the 400EX. Totally dead in the DS650, and not bad at all in the Raptor. JMHO

 

MBRP full bore system, you will not be disappionted 817-441-5893

 

WHY in hell would you want to get rid of the Yoshimura exhaust? It was rated one of the best. You have too much money to spend?

 

Duncan is accepting applications for rider support, kind of like a mini sponsorship. They help you out and give you a great discount on anything you buy from them, but you have to run their pipe. I have called them a couple times with questions and to order stuff, and their customer service is the best I have ever seen. Lenny Duncan spent a half-hour on the phone with me tallking about carbs. What other owner of a racing company would do that. Not LoneStar, that's for sure. I called LoneStar once for a torque spec on the bolts on one of their products and the guy told me "We don't know how tight to make them, just put some loc-tite on it and tighten it pretty good."

Anyway, that is why I am thinking about switching from the Yosh. I will just sell it on E-Bay if I get a new pipe. Thanks for all the replies!

RR1

 

Yoshi makes the most useable H/P, don't get fooled by anyone's peak #'s