your car should be faster than a stock 135i. until he starts modding, which is when you could start modding (or before that preferably). With some kind of pulley setup (ASP 178, LET 181 or 185, Code3Performance), intake (Needswings, SL55, or others), tune (InMotion or LET), you shouldnt have too much trouble with some of those cars. Heavily modded EVOs and STIs and skylines may still give you difficulty. But with just those three mods alone, you will certainly have a very quick car!