Top of my list would be a decent cat-back system. My Duplex system cost nearly £600 so that's most of your money gone in one move. Something like a Janspeed single system should be under £300
Next probably XPower springs. Next on my hit list as they really improve the already fantastic handling without dropping to an unpractical height.
Getting dencent vented disks on the front would probably be a good move too
Or you could just blow the whole lot on new wheels and tyres. You can get the Kei Force 10's in 18" like I have for around that sort of money now. Don't get them with budget tyres though - they always stink.
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