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this has been covered many many times in the forced induction section. the turbocharger is generally the last thing to upgrade, and you need a few supporting mods to make it worthwhile (not to mention about 7k if its a stock car) so its not just as simple as getting a new turbocharger

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you can still put the turbo on though, its just you can only push it as far as the engine can go, my engine is standard with the T78 and its pushing out 200rwkw atm but needs to be tuned, only mods are exhaust, wastegate, bov, fuel regulator and fuel pump aswell as a microtech ecu.

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