have a vacuum pump on there truck
ive been doing some reading and i dont think theres a downside to vacuum pump on my 150 000 mile truck

opinions please

oh the pump is from GZ motorsports (google for website)

thanks
Jordan

PS. talked to the guy at gz a long time ago and he said that id have to space something or shim up the pulley or something because of the way the LSX pulleys are setup can someone help me understand why?