Oil coolers may be mounted in front of or under the radiator. The air inlet to the radiator may be sealed with caulk or tape. Stainless steel lines may be used for oil and fuel lines. Only the OEM rubber fuel lines maybe replaced with stainless steel lines. Fuel pumps and pressure regulators are free.
Fuel filters are free.
Engine timing is free. Air conditioning and Cruise control components may be removed. The catalytic converter may be replaced with one that is EPA approved but must remain in the stock location. The Stock pre-converters may be removed or hollowed out. The stock exhaust manifold must be used.