define cheap... ?
anywayz...
1. A good set of 4-2-1's, high flow cat, 2.25" exhaust
2. "Ram Pod" Uni filter
3. Split fire Spark plugs with 10mm racing leads.
4. Lightweight 15" or 16" rims with low profile tyres.
Try that for starters... you'll see a significant difference. Thats what I've got.
Kind Regards,