hey lex thanks for the nice words. thats my car by the way. i already have headers on it with a full twin 2.5 inch exhaust. im running 440 injectors and a walbro fuel pump so the fuel system is good for much more power. to get it up to 15 psi i am having a custom crank pulley made up either 7.5 or 8 inch diameter. the belt looks stressed becaused it was damaged as i was testing the system (the supercharger wasnt 100 percent in line with the crank pulley). cobra i cant machine the ribbed pulley you are talking about because the ribs actually make up the pulley. if i was to machine them flat the pulley would fall apart. to achieve 15psi all i would need to do is move the supercharger forward by about an inch and install the new crank pulley. Not a big deal reallly and well worth it, on 15 psi it will make a massive amount of power. by the way the car made 206rwkw with a restrictive exhaust (fixed now) and with the auto abou to slip (had been on the dyno for about 2 hours) should make more power now