aren't you not supposed to use udp with fi?

just wondering cuz i have a set of udp's over at my mechanic's shop waiting for me, but i'd rather get a blower if i can't use the udp's

 

75 shot - and when we dyno tuned it I came out with 251 RWHP and 330 torque.

 

If you use UDPs with your blower, you will underdrive the blower and get less boost than you would with a stock crank pulley because the supercharger is spinning slower. Nice gains on such a small shot Jim!

 

I am running a 150 shot and love it! No problems so far. My car dynoed in at 435whp and 561wtq! Thats on a very safe tune. I have 6 deg's of timming pulled and running a flat 10.8 afr....As long as you have a good tune you'll be just fine on the bottle