if u wanna go the cheapest way. buy a 13:5.1 pistion 200 dollers stage 2 hot cams 250 dollers and u wont have to change anyhting to done those mods! just jetting take the baffle out of ur stock exhaust to where u just have the end cap on it. take ur air box lid off and u will beat the 06. the HRC kit is a waste of money all u get is a cam and then stupid stuff that u dont need like air box lid a end cap for ur exhaust stuff liek that

 

i think the HRC kit was worth the money. cam $150 Jet kit $65, and all the other goofy stuff. it helped a lot. but an aftermarket exhaust and intake and jetting with a cam will help. either get a big bore kit or the JE 13.5:1 piston and you will have all the power you need.