acheiving maxium bhp without changing turbo?

[Lacey123]

What mods can i doo to the car with out putting a larger turbo on it too make it quicker?

 

[marcyp]

this has been asket loads of times
apart from doing what youve already done
maby another map
but going for a bigger turbo is always more fun
n2o is always an option but i dont know what jets the 20vt can take on standerd internals