Stillen only requires A2A if you want to make over 420whp safe. Its ok up to that point. Which is still 70whp more than bolt ons will give you. Or, up to 200whp more with the A2A kit.
It comes down to how efficient you want your money to work for you. How much hp per $.
Anyone know how much it costs to get 350whp NA?
Honestly, I bet anything over what the stock AT or clutch can hold is where the delta starts changing on the $/hp
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