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And for a lot less money than a turbo or blower you could just change cams and do some head work to make good gains, i have a Holden ss with big cam etc and I'm sure it's got more go than what you...

5l as in Holden 5.0 v8?
If so each had their own bonus and drawbacks. The blower will generally cost more on oats but be easier to fit as it's all bolt on. The turbo will take a lot of fabrication...