Well the TR-6's are a great pipe better than most that are out on the market. But like you said they are good for stock motors. If you plan on Porting and polishing the motor to a aggressive to race port I would go with the T5 but if you just do a trail port and polish then get the TR-6. I have the TR-6's with a 1dirracing intake, reeds, and spacer and it completly changed the way the pipe sounds and how the bike responds to the throttle.
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