Jason’s mechanic had somehow cross threaded one of his spark plugs, causing a constant misfire on one cylinder. Turned out that he was looking for an excuse to ship the car in from Florida for custom dyno tuning anyways. We used the borescope to make sure everything inside the cylinder was healthy, then replaced the damaged spark plug threads using Heli-Coil. After a test drive and data scan verified everything was good to go, we got to work on the dyno. End result was 599 whp on E55 fuel. However, we had to keep a relatively short leash on the boost, since this Purple Belt car was still running the factory HPFP with no upgraded internals.

Last year Kaylee and Jonathan drove more than 1,000 miles from Texas for our Blue Belt Performance Package. This week they upgraded to Purple Belt using the soon to be released Tapout Tuning module. This unit produces a much smoother powerband than any other tuning device for these cars. And it stores seven different calibration maps, that can be switched on the fly in just a few seconds using the no charge cell phone app. Here were the final results:

• OEM baseline = 426 whp on 93-octane
• P1 = 445 whp on 93-octane
• P2 = 500 whp on 93-octane
• P3 = 510 whp on 93-octane
• P4 = 520 whp on 93-octane
• P5 = 584 whp on 93-octane with methanol injection
• P6 = 599 whp on 93-octane with methanol injection
• P7 = 619 whp on 93-octane with methanol injection (see attached dyno chart)

Kaylee and Jonathan now have the most powerful CT4-V Blackwing in the world, except for our flagship car.

Check them out on the CT4-V Blackwing Dyno Rankings HERE!

We’ve had Alek’s beautiful M6 CT5-V Blackwing at our shop over this past winter to install various bolt-ons as well as a set of Kooks Competition Only Headers to see what kind of power we could get out of it. Keep in mind that the beautiful exhaust sounds you’re hearing is with the Kooks Headers System and STOCK MUFFLER.

Before any modifications were installed, it put down an average baseline of 620 whp. We then installed the following items:

– Kong ported supercharger
– Kong throttle body
– Griptec pulley system with 2.18” pulley
– Gates FleetRunner supercharger belt
– Green high performance air filter
– Colder Brisk spark plugs
– Kooks competition only header system

After putting the car back on the Dyno it made 702 whp! That’s a huge gain with no tuning. Not only that, but the car is incredibly healthy and responds extremely well to all of the parts. This thing is an animal on the streets and we can’t think of a better combination of performance and sound!

Jeff brought us a completely stock 2016 ATS-V with 85,000 miles on the odometer. We installed the Purple Belt Performance Package, in addition to Mace Stage 1 valve train components. Check out how strong his powerband holds, all the way past 7,000 rpm! Jeff will certainly have a lot more fun racing now!

Way back in 2008, Bob Cook built and drive the first GM Series II/III FWD to ever hit an eight second quarter mile, running 8.95 @ 157 mph in his ’99 Grand Prix GT. 15 years later at the 2023 Cadillac Attack, Bob was behind the wheel when his 2016 ATS-V became the first to crack eights. After three days of racing, we was able to lay down an 8.97, 8.86 and then 8.77 seconds on his final pass.

Modifications include the Tapout Tuning Brown Belt Performance Package, with the turbos switched out for aftermarket units. The engine, cylinder heads and intercooler are still stock except for forged pistons and stronger fasteners. Basically this car is running the initial beta test of our future Black Belt Performance Package. It will take a while to figure out how to neatly package and produce this kit at an affordable price. Stay tuned, since all details and pricing will be announced later this year.

Tapout Tuning is the main innovator for the LF4 platform. We pride ourselves on offering the best possible parts, service and tuning.

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