ok real hp gains
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Normaly you gain about 18-22 HP from just headers the tune would add a good 8-10 and you will prob get another 8-10 with the borla opend up. So its safe to say any where between 30-40 hp. I dynoed 310hp and 326 ft/lbs before my headers. Then with headers,pulley,td's and a tune I dynoed 357hp and 369 ft/lbs.
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I had the same gears and all mods except i had a ud pulley and duals. dyno'ed the numbers in sig. The gears will take alittle gain out of your rwhp but the track is where all A4's shine.