If you want a pure bolt on replacement, there is the turbosmart and the boomba, with the boomba being the louder of the two. When others refer to the cp-e blow off, it's the cp-e exhale pipe they are referring to. This plugs the current bpv on your turbo and creates a bov flange on your cold side intercooler piping. The options for those are tial and hks. Out of these two the hks is the louder one, but is more of a classic whistle sound while the tial is more of a "grunting" bov. Hope that helps
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