i have a 2001 busa i put the high mount devil dual exhaust on my bike 2 years ago...when i get to 100mph my bike stutters and shakes like it is choking....i have a pc2 on it with a custom map...i have a tre also...k&n airfilter...and have change the spark plugs...i have had this problem since i have put the devil on my bike...i love how the pipes look under the seat of my busa and i really dont like the hmf pipes because they are big and fat compared to the smaller devil pipes...