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I think they might work on cars with a very non-restrictive air filter (a.k.a. nylon sock)
On cars with normal air filters (including K&N) the turbulence created by the air going through the filter will rob the "ram air" effect of it's punch
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I still wave at Boxsters, but they no longer wave back :-(
2002 Boxster S "Violet" (sold but not forgotten)
2009 Carrera 4S "Kelsey" (current ride)
2015 FIAT 500e "Nikki" my commuter car
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