Chris came back for a retune after installing the factory cats back on the Z. We were pleasantly surprised with the results.
On 9 psi of boost and 91 octane for 352 whp & 377 torque.
On 11 psi of boost we made great numbers. 398 whp & 380 torque.
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What pulley did you use to get 398hp? The 100mm or the 110mm?