Stock header w/ Slip On vs 08/09 YZF Full Exhaust
Posted November 04, 2013 - 10:22 PM
Posted November 05, 2013 - 06:07 AM
Posted November 05, 2013 - 06:14 AM
The YZ header is a few mm larger in diameter.
This helps top end and over-rev, at the expense of off-idle torque.
The DR D Muffler is larger in core diameter over the YZ muffler.
It is the same type of difference as the Header.
If you got a Dr D header to go with your Dr D muffler, you would be in the best of both worlds, as the pipe would then be 'tuned' for the exhaust pulses, and you would scavenge more at all rpms.