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GaryS · 08-13-2012, 10:24 AM

Afaik no one has ever done a comparison test. HPF is the shiniest, AA has a cool Darth Vader look, Helix is really big, ETS is drop-in, Dinan has the least pressure drop (or did at one point).

08-13-2012, 10:24 AM	#7
GaryS Colonel Drives: 2009 135i 6MT Join Date: Feb 2010 Location: Maryland Posts: 2,076 iTrader: (0) Garage List 2009 135i [3.25]	Afaik no one has ever done a comparison test. HPF is the shiniest, AA has a cool Darth Vader look, Helix is really big, ETS is drop-in, Dinan has the least pressure drop (or did at one point).