Well welcome, to get anywhere near there, IF you are LUCKY youll need a m370 INTAKE Manifold and TEST PIPES/HFC/ HEADERSAND finally an UPREV TUNE , you said that you don't want to make the car louder but 2 of the 3 things I stated that will get you to 400 crank (POSSIBLY) < Highly unlikely though will definitely make the car louder GL!
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