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As stated the tune is everything...
My first KA-T setup cost me 800 dollars and was solid because I stayed below the recommended boost levels. I added a wideband, safcII, S15 injectors and backed the timing off. I drove it daily along with lots of drifting, auto-x and some drag.
Keep the boost reasonably low and you will be fine. Whats the compression of your engine currently across all 4?
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