Craig from New Jersey shipped his ATS-V in for the complete Brown Belt Performance Package treatment. Jorge worked his magic with the parts, then Craig flew in to meet us on dyno day. Nine pulls later the car produced peak power of 683 whp and 659 wtq. This ATS-V made a bit less power than we usually see with the well respected Caddy Issues turbos, since Craig still runs catted downpipes. Regardless, he had no trouble breaking into the list of the top 25 most powerful ATS-Vs ever!

John from Toledo came by our shop in his 2014 CTS-V Sport. We changed his engine oil and filter, replaced the leaking intercooler fill port, then filled and bled his intercooler system. We worked up a custom tune on our DynoJet, for net gains of 34 whp. Air/fuel and boost curves are much nicer now, and the electronic throttle stays completely open too!

Our good friends at Exodus Performance in Austin, Texas just knocked out another Blue Belt Performance Package, with this one using EPA approved catalytic converters. Mike’s car was a very rare 2019 ATS-V M6, of which only 21 were produced! As always, Exodus did a great job with the installation and the car put down a very broad powerband.

This anonymous canyon carver from a neighboring state showed up today with a 2016 ATS-V. His intercooler wasn’t working due to an air pocket, so we installed our intercooler fill/bleed kit. Also gapped down some fresh spark plugs and tuned the car with intake, exhaust and everything else completely stock. Final numbers were impressive with peaks of 497 whp and 489 wtq SAE corrected. This car is going to be even more fun than before with its newfound powerband!

Don and Jessica from Louisiana drove in with their beautiful new CT4-V Blackwing. The car was ready for it’s first oil change, so we took care of that for them, upgrading the filter to the extra heavy duty AC Delco UPF63R. We also installed the newly released Blue Belt Performance Package before working our calibration magic on the dyno.

These cars are rated at 472 peak crankshaft horsepower from the factory. Assuming 12% chassis dynamometer loss for cars equipped with the A10 transmission, this car should put down approximately 415 whp. Our DynoJet 224xLC once again proved to be within one percent of perfect, showing 412 and 413 whp on two back to back baseline pulls.

After installing parts and tuning, the new peak power measured at 516 whp for a whopping 100 whp gain! The car showed huge gains all the way from 3,800 to 6,500 rpm. On the A10 cars, they are nearly always between 4,800 and 6,500 rpm when you’re at full throttle. And this car picked up 85 to 115 whp across that entire range!!