Okay, I'm not gonna argue over pipes but I believe the fatty's are very under rated. They are much like the t-5's but may sign off a tad earlier. I wouldn't do t-6's, how long are you really gonna keep it stock? Alot of people may say that and then they get a taste of power and want more. I've used fatties for the trail and they do pull hard, you really cant go wrong with fatties, for the money there not bad, quality could be a little better but every pipe out there has at least one draw back. Just my oppinion. :beer: