- A tune is required for any drastic changes you make to a motor setup.
- 550cc's are too small for your 400hp goal.
- A disco potato will not reach 400hp
- GT2871R can hit 400hp with supporting mods and keeping relatively quick spool. You will never see that same spool as a stock turbo as you increase in size/hp potential.
- It's spelled input not imput...
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