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How much more power do you really need on the streets? Unless you're trying to run sub 10 second quarter miles or compete in drift events, 621whp is more than plenty. I made 510whp and 601 wtq on 93-octane (tune-only & no bolt-ons) and will be asking my tuner to provide me with a stock file when I go to the track (Motorsports & auto cross) this Summer.
OEM components start breaking the higher you go. Stock rods start bending after 650 wtq. On a rwd car with a transmission that is rated to 400nm (at the crank) from the factory, how are you going to put it all down effectively?
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