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I have a friend who races spec and his dad and him use a catch can and block off the the intake vent. They've been racing for years like that with no problems. My friend is the only certified installer for the L&N IMS solution in Texas. I followed his advice and did the same to my rallycross boxster. I forgot to vent the catch can and oil started coming out the crank seals. Besides that, it's worked pretty good for me. I've heard from another friend that you lose power by using a catch can but I don't feel it. I also don't see my friend's car any slower than the rest. Just my .02
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Woody
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