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2.5" vs 3" exhaust

  1. 2.5" exhaust vs. 3" exhaust on stock internal K20A2 (Dyno)

    All Motor K series Technical Discussion
    After a couple months of running around at the 211whp/152wtq power level in my K20A2-swapped coupe, I decided it was time to change something and get a little more pep from her. So, a friend of mine who had just recently gotten rid of his turbo EM1 offered me his Thermal 3" exhaust at a very...
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