what do want?

more power?
better handling?
looks?

if u want power for low cost, you could get a new header, mild EMS tuning, high performance radiator, or try to find some ITR internals but those will be more costly.

if u want better handling, get some ebay strut bars, and some Tokico shocks.

if u would rather look good, get some used rotas, maybe some wheel spacers, tint
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this link below is a good place for knockoff(but still high quality as well as bling factor) racing seats


http://f1spec.com/