on my red samurai with a 16 valve in it when I first got it, it had the high pressure pump mounted to the bottom of the tub, it worked fine but you could not hear yourself think it was so loud, i then moved it to the frame with the stock sammie filter in front of it with no high pressure filter at all and it works great, the only time I had a problem was changing out the fram filter for a new napa filter from russia, it killed my rig in the middle of a run and had to be towed out, changed out the filter to fram again and never looked back!