asked a thousands times before i bet. but im probably buying a astra off someone on the forums and is a x18xe1 engine.
basically what sort of gain will i get from..
> basic normal mods like exhaust and airbox mods.
> a s/s manifold
>remap, these any good?
what sort of other things are worth while?
not going to say who's astra im hoping to buy as i wanna post pics when i have it and see if you can all guess... :P