Quote:

On many bikes they are useless because the header pipe have a similar shape at the beginning.

If you change the header pipes with larger, you obtain better mid-high range and torque cones can correct a bit in low side.



So, if I'm understanding you, these won't help me unless I up the header diameter to 2" or so? With the stock header it is not going to help, huh?

2002 Bandit 1200/ GSXR cams/ 1277 BB Kit/ Holeshot header and can/ 38mm flatslides/ a good head/lotsa hp/lotsa tq- lots of rear tires...