I have corolla 2005. i swaped the engine with 1.5l 1nz-fe (toyota axio engine). i want to increase its H.P.
Also a friend of mine told me to do the following modification and ull get 10hp gain surely.
-Cold Air Intake
-Iridium Spark Plugs
-Better Wiring ( 5 Core For Plugs)
-Custom Polished Headers
-Free Flow Exhaust
So do you guys agree with this. will the modification do 10h.p again. Also please refer me a good expert mechanic for this and the total expense.Thanks