4-PR Performance has the utmost in house machining facility in the Mid-West, for specializing in ATV & Dirtbike performance enhancements, motor modifications and repairs.  Some of our machines include: lathes w/digital read out,  milling machines w/Digital read out, drill presses, boring bars, Sunnen honing machine, Rottler valve seat and guide machine, Miller welders,  ABS soda blaster, cc berretts, calipers, Intercomp spring tester, and a Super Flow flow bench w/port flow analyzer- so we can measure the extreme power we are capable of getting out of each and every head we touch.      Along with our Super Flow Flowbench we like to also see just how much horsepower we are truly producing out of our modified engines, by using our Dynomite Dyno. This machine also helps us tweak our engines either for jetting or so we can indicate if more horsepower is available out of the motor.         We at 4-PR Performance also specialize in suspension, we are considered to be one of the best in the country. We take pride in what we do down here at 4-PR.  So to take care of our many customers we move our jobs to what we call our  "Assembly Room" ; which is separate from our machine shop.  Before we assemble we make sure all parts are cleaned thoroughly by using our other state of the art equipment, our Pro Ultrasonics  parts washer where it cleans at extremely high decibels and with a high amount of heat to get that brand new out of the box look.   Only to ensure that every job goes back together tight, sealed, clean and free of debris.