EVOgone said:
KONI suspension kit for 330 at DT with Cliosport discount. Will transform your car.
Handling and Brakes should always be the first port of call.
I agree.
Forget the engine if you only have that much to spend. I have spent a few thousand on my engine and I think if I had to choose between my coilovers or the engine work I would choose the coilovers.
IMO an SS custom exhaust is a good mod for a better noise but no power gain.
If your heart is set on the engine you cant go wrong with Bens inlet work, I have had it done on my car but only as part of a bigger package of work. If it was me I would save up another few hundred and get a remap and Bens inlet manifold This work can be done by GDI who are in the same building as AWT(BenR).
Other reputable companies are Hill power (Midlands)
http://www.hillpower.co.uk/ and BBPT (down south I think)
http://www.bbperformancetuning.co.uk/. Hill power do the inlet work and I think he does his own ECU chips. Not sure about BBPT although they do a Group N ECU for about £350 I think.