Those graph are interesting in that they all show a loss of torque in the low end. I think thats just for the slip on, and a header would address that.
Unfortunately, LV doesn't yet make the full system for the GP... unless you can mate the GP pipe to the EVO header? Dunno.
2007 Versys Black, V35 Bags, H&B Bars, Skidmarx Hugger.Fender Ex., Avon Distanzia, Braided Lines, Hella 65W bulbs Arrow Can, DNA Air filter, GIVI tall screen (for winter), PCIII, Baldwin Saddle. **SOLD**
2011 KTM SM-T. Crash bars, E55 Top Box, Fender extender front and rear.