For low end response:Lightweight pulleys.Keep the stock airbox (SRI & CAI = loss of low end torque)Get a K&N or an aFe drop -in filter.Tighten the throttle cable (if your car has one)
My Fleet:
'15 Ford Fusion AWD Titanium 2.0 Tutbo
'14 Lincoln MXZ AWD 2.0 Turbo
'14 Nissan Pathfinder AWD SL
'05 Pontiac Vibe AWD
i was always under the impression cai was for more high end and sri was for more low end, is that just HP?OH how could I forget:Ported Throttle body (non dbw)Throttle rotorthe ported TB i noticed a difference, in low end response.