for the money i personally wouldnt bother the likely hood is you physically cant feel the difference. same idea when people fit a indcution kit to some cars for a 4-5bhp on a 200 bhp engine and claim its transformed the car. i cant remember where i seen the artical but it was some aussie tunining coming that had basicly used there customers and in house dyno as a data pool and worked out any bhp improvement of under 13% was almost impossible to notice from the drivers seat unless the person was told of the increase so they beleived it was actualy more a plasebo effect making you feel the pow