hey, does anyone know what setups I can do with the stock motor to get into the 15.3-15 secs?? I don't want FI too much money just enough to get the racing feeling

 

An H22 swap would probably be the easiest way to reach your goal.Headers and intakes catbacks don't really help all that much.I know you asked for mods with the stock motor, but without a turbo or maybe nitrous it gets expensive quick.

higher compression forged pistons.$450
port and polish? i don't really know but not free.
performance valve job ?$500 and up

at this point youve just spent enough for the h22

high lift cam another $450

chipped P06 ecu $150
getting someone to dyno tune it $250-?

I looked into doing this to a f22a4 I have a few months ago.I may not be right on needing all this stuff.But I think I'm pretty close anyway.