Induction kit & a performance exhaust won't do any harm, not really going to get any power gains, but better response from the engine when you put your foot down.
A cold air feed is the best, i.e. K&N cone filter with a dedicated breather pipe or something like the BMC CDA kit.
The thing that's going to get you the most BHP from that engine is a good & proper service though, either by yourself or book it in to a good garage - I advise VAG parts throughout even if they cost a few more pennies!
Other than that unless you want to spend SERIOUS money (superchargers etc.) then just be happy aspiring to get the 115bhp it should have!

Welcome to the forum!
