Underdrive pulleys crank plus the the other 3

[m3f_96BmwCosmo_c44c0f570d]

is it smart to do all the pullies including the crank pully lightned alt pwr str water pump?

[m3f_Gilbert_43a469a9d9]

IMO....Underdrive pulley's are a foolish add-on. Not worth the claimed extra HP.







Been there, done that.....what's next.

[m3f_SG_M3_d1201712b5]

LOL, says who Gilbert.



I saw 11 rwhp gain with just a ERT pulley. The crank pulley is where the power is. The URI accessory pulleys don't hardly underdrive, its all in the crank pulley.

[m3f_Gilbert_43a469a9d9]

If you saw it (and I know you didn't, not 11hp anyway, and definitely not at the rear wheels, i.e. bhp), then you should be able to direct me and anyone else on this forum as to the magical location of the Dyno results.



Hearing someone tell you is one thing, seeing true dyno'd results is another.



Been there, done that.