of engine
u can change air filter (K&N o open pod like apexi's)
denso idrium spark plugs
lightened & Dampered Crank Pulley
Port n polish
Performance Cam shaft
Adjustable Cam Gear
form work exhaust system (4-2-1 til the end :P)
sifu-sifus out there,
i'm using a GSR engine on my wira,i've been using it for more than half a yr dee,b4 this it was all ok
till recently,i find tht the engine starts to jerk when i tekan on the accelerator,if...