Finally got my GruppeM installed. Took two burly guys, a heat gun, a screwdriver and numerous chipped and torn fingernails to "slip" the coupler onto the filter, but it was well worth it. Car is quiet below 3000 RPM (a slight but innocuous hiss) and just screams above 4000, along with very noticeable additional forward motion. Along with the Dinan TB and Stage 3 software, it's everything I was gunning for.
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