Originally Posted by mab864

Completely stock 370s put down about 280 whp. Mine was 297 whp with a Stillen G3 intake, Berk HFC & Berk CBE on a Dynojet. After Uprev and custom tune I was 324 whp on the same Dynojet. My numbers are very typical with those mods and a tune. The tune made by far the biggest improvement in performance. The exhaust made the car sound great, but the tune improved drivability, throttle response, and performance.