how cheap is cheap? u wanted about 20-30 extra kw atw?
ur not gonna get an extra 20kw atw with bolt-ons thats for sure... and if u do, maybe IHE bolt-ons plus ECU tune will get u that, but be prepared to pay maybe $3k or more for decent stuff...

for that money, the easiest solution to go fast is a bolt-on turbo or supercharger kit.