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All our power testing was conducted on a chassis dynamometer. However, we also have flow numbers on some of the aftermarket cylinder heads, and the flow rate increases were mind blowing!

If/when you decide you'd like to get this issue resolved, we can work with you remotely to data scan the knock, remap your ignition tables and get this all taken care of for you. https://www.tapouttuning.com/product/remote-tune-for-e99-global-b-vehicles/

We have tested nine different sets of ported LF4 cylinder heads, with some of them done by very big names. In every case, there was a significant power drop. We can't explain what these companies are doing wrong. But we can confirm the factory cylinder head design kicks serious ass!

Looks like we should have the first carbon fiber driveshaft here for test fitting soon. If anyone with a CT4-V Blackwing A10 wants to have the very first one, we can offer free installation for you. Please email me directly at ScottC@TapoutTuning.com to set it up.

We provided samples to our manufacturer back in July. I just sent them a follow-up, and let him know that the natives are getting restless.

Are you filling with 7.0 quarts with each oil and filter change?

Yes, tuning provides the biggest gains on these cars, since the turbochargers are controlled by the ECM. https://www.tapouttuning.com/product/remote-tune-for-e99-global-b-vehicles/

How much more power would you like? https://www.tapouttuning.com/product-category/ct4-v-blackwing-performance-products/performance-packages-ct4-v-blackwing-performance-products/

We received your email and are sorry about the problems. Of course we will get everything taken care of for you, but it be toward the end of the week. Unfortunately, it's a long holiday weekend, and everyone is out of the office for the next several days.

These cars won't need port injection to hit 800 whp.

Yes, we'll be happy to include this if the customer wants it.

Sounds good. We'll be here when you're ready. :) Yes, we are working with JLT on an intake system. Should be released by spring. DSX has an auxiliary LPFP available now. We're installing the first one today actually.

The two main mods that cause Check Engine Lights on the CT4-V Blackwings are the carbon fiber intake lid and downpipes. However, those can be easily cleared with DTC Assassin, or completely circumvented with HP Tuners custom tuning. Check out these Performance Packages, and feel free to email...

We didn't detect any low rpm surging in the first A10 car. This week's car also has A10 transmission. We are disabling the variable valve timing (VVT) in these engines when we upgrade the camshafts.

No fuel system upgrades were required for this build, since he's still running pump gas. However, the cam does include a modified fuel lobe, so that boost high side fuel system capacity. There are also no cooling system mods on this one. The one we're doing next will have fuel system...

We agree. That's why we don't cut any corners in our builds. For this one, we installed the camshaft with oversized fuel lobe, HPFP lash cap, BT Racing valve springs and titanium retainers, hardened pushrods, phase limiter plug, AFM delete lifters, MLS head gaskets, ARP head studs, new...

We trusted the manufacturer who has already done all the research and development, and sold hundreds of LT4 blower cams. And the result was excellent.

GPI doesn't publish their cam specifications. Here's what they say about this one: This is the perfect cam for the hardcore street / strip enthusiast, and makes more torque and horsepower than our L83 PD1 and L83 PD2 cams. Very strong to 7000 RPM. Track tested, developed, and proven! Requires...

We installed a ported supercharger, ported throttle body and GPI cam package on this CT5-V Blackwing . It already had a set of Kooks headers installed as well as a custom cat-back exhaust, but needed a little more bite to go along with the bark.After completing the parts installation and getting...

Well, it's only a CT4-V Blackwing, but we were able to beat the fastest known CT5-V Blackwing's time last weekend at Darlington. Crank up your volume and enjoy the sweet sounds of this little V6!