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With the Active Exhaust valves closed, there was almost no difference. With the valves open, it was quite a bit louder and more aggressive.

That power level is no problem at all with the CT5-V Blackwings. We did the very first one for HP Tuners a couple months ago. Far more important than the peak power are the gains in the middle of the powerband. You can see here that we picked up 135 whp and 135 wtq at 5,250 rpm, right where...

Our OEM driveshafts are two piece. We can do carbon ones like we did for the ATS-V, but we'll probably hold off until there's a little more demand...

Yes, any time boost is increased on any car, it's always best to run colder spark plugs with smaller gaps. Changing spark plugs on these engines is tedious the first time you do it. After that, it's not really bad at all.

We sell them as a pair. So just order one of these: https://www.tapouttuning.com/product/green-high-performance-air-filters/

It's totally fine, as long as your car is tuned for that fuel.

91-octane will be 20 to 40 whp less, depending on the fuel quality. We can do an excellent job remote tuning Blackwings, since they have dual wideband oxygen sensors from the factory. The process begins by ordering one of our remote tunes. Then we send over detailed remote tune instructions...

We're here to help. :) https://www.tapouttuning.com/product-category/ct4-v-blackwing-performance-products/performance-packages-ct4-v-blackwing-performance-products/

From the factory, this feature only works for Tour, Sport and My Mode. We are currently working on driving mode non volatility, like we currently do for the ATS-V community. What this will do is allow the ECM to 'remember' your driving mode (including Snow/Ice, Track and V modes), in addition...

We figured this out for the ATS-V community two or three years ago, and we're getting closer on the Blackwings.

We have been working on this for several weeks, and today we were very close. We now have the ECM portion figured out, but it appears the BCM is fighting back. Please stay tuned...

This week we completed CT4-V Blackwing Blue and Purple Belt Performance Packages in house, tuning with the newly released HP Tuners access to the Global B ECMs. First chart below is a Blue Belt running 93-octane pump gas. Notice that our tunes don’t just hit the peak power number for 50 or...

You might also consider Nitto 555RII P275/40R18/LL. I was able to run these on our CT4-V Blackwing with OEM wheels. Not sure if they offer the correct 19" size for CT5-V Blackwings...

It took a TON of work to figure out which tables were missing, locate them, etc. But as of today, it appears we can pretty much do whatever we want. We are not that concerned with GM's over the air updates. If they know what we're doing, they can choose to void our powertrain warranty. We...

I can help if you're running drag radials. On street tires, you're pretty much screwed.

All Brown Belt ATS-Vs are in the 675 to 760 whp range, depending on many details, with the average being 715 whp. We expect CT4-V Blackwings to be right in that same range, and we're currently at 716 whp with our flagship car.

We shot a video with HP Tuners a few weeks ago when we were assisting with Global B testing, validation and calibration table locating. It gives you a neat overview of the product, and includes some cool action shots as well. Please ignore the black eye. I had a rough sparring session the...

We can now tune both the ECM and TCM in cars equipped with A10 transmission. https://www.tapouttuning.com/product/remote-tune-for-e99-global-b-vehicles/

The factory fuel system wasn't designed for ethanol, so there could potentially be long-term side effects to the fuel injectors. That said, we haven't experienced any side effects from running mild ethanol blends in the last few years of doing these mods on hundreds of ATS-Vs with nearly...

For those of you with this problem and your dealer is unable to get it resolved, I have a good feeling we could diagnose and resolve this for you now that custom tuning is available. https://www.tapouttuning.com/product/remote-tune-for-e99-global-b-vehicles/