Citos4drsi
Well-Known Member
I just installed my P2R throttle body spacer as well as the Injen CAI on my 2012 4dr si. At low rpms there is a high pitch whistle that goes away as the rpms increase. It seems to only happen when I give it full throttle. Any ideas on why this is happening. I'm thinking its maybe a small leak from the TBS but im not 100% sure