Best aftermarket part for horsepower

[mike82]

Hi guys! a friend of mine just got his hands on a 2012 CRF 250r, perfect condition, like 9 hours on it, already bought a yoshi RS4 full exhaust system, Ive been reading a lot from old posts on re mapping the ECU, but my question is: which is better? Im thinking of buying the moto tassinari intake boot, for starters, and also thinking of getting the ECU tool, still hessitating on buying the one that yoshimura sells , or, the one honda sells, which one is better and more user friendly (easy to understand), and will the intake boot from tassinari give the bike extra power all on its own? or is the ECU tool a MUST??

[Dunny29er]

The Yoshi is more user friendly, as it has a map switch between 2 maps u can do while your riding. But in saying that it doesn't change the ignition settings. So i had my ECU ignition mapping mapped by Eddie, and then use the Yoshi programmer to change the fuel mapping.

Best mods:

Exhaust: FMF, Yoshi etc

Cam: Hotcams, RHC etc

High Compression Piston: vortex, JP etc

[fiveboyces]

Best aftermarket mod: a 450