I had some some trail port on my Scp pipe and it ran well on the lowend.I had no problem with the tight trails were I ride.But now I got a good port job so I don't know where my power is going to be at now. But I used the stock carb with my pipe I say that has effect with better low then the bigger carbs. Will let you know after I get off work tomorrow when I go wot for the first time.