After i took the stock intake silencer off! i can hear the different and turbo spool up. but there was a wierd sound comes up. it sounds like ku.. ku.. it make me feel like somthing was stuck, it happen right after i release the gas pedal at approximatly 2000rpm~3500rpm in 2nd gear or 3rd gear after stock blow off sound! especially cold weather...! anyone feel the same as i do? or my car is already hurt? the only Mod i have now are Turbo Timer! all the others are still stock. should i put the silenser back? kinda worry? hope can hear your suggestion or advice ... thanks...!!! i live in CA !