I saw a cam and spring kit for 430 dollars and comes with everything includins a new piston why is it so cheap it also says it will double my HP with there pipe kit, is this true? Basically can you tell me if the kit is worth it or what this is all about?

 

i want to get it for my bro for his b-day but i have alos been loooking for reveiws .....help us!

 

you will see an increase in hp with a full exhaust
i dont think double or anwhere near that though