I have a Star. I believed the hype and bought what I thought was the best option even though it was way more expensive than the others. I also bought the fancy separated catch can. Now to be fair my motor is not optimized for a vaccum pump but I get next to no vaccumm. I have the releif valve screwed in all the way and get 0 at idle and maybe 3 pounds going down the track. Plus as an added bonus it will fill up the puke tank and then spray oil all over my engine bay including my ceramic coated fenderwell headers. It is now collecting dust under my work bench and the old school pan evacs went back on! Now in fairness to Star my buddy has one on his Pontiac and thinks its the cats meow!!!!!