Ive recently purchased a 2007 xr650l. The mods the guy had before me were removed snorkel, removed smog, and slip on white bros exhaust. Ive read some on daves mod and how it improves performance drastically. Also a new jet kit would be required. Ive also read that its better to get a keihin fcr mx 41 and rejet it then. which solution would give better power and by how much?