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Dyno-Comp added the APS exhaust to my APS TT system yesterday. They retuned it and here's the new dyno, up about 36 HP, and now has 410 lbs of torque. The Dyno Dynamics Dynamometer (load bearing) typically reads lower than other dynos.
Did the exhuast necessitate a retune? Or were they retuning just to optimize things for you.
They told me the boost would go sky high without a retune after installing the exhaust, but they were also trying to get a bit more power without having the restriction of the OEM exhaust.