You should remember the Kratos KRAS55bi S55 turbocharger upgrade from when the S55 stock internal output record was set using them. That was back in December of 2018 on an F82 M4 S55 at 32 psi of boost on E85. Well, now we have some built motor numbers and they exceed anyone's expectations. The Kratos KRAS55Bi turbos are touching just shy of 1000 rear wheel horsepower (with potential to eclipse that number). A built S55 obviously can be tuned more aggressively and torque can be ramped in harder and earlier. Graph: Notice how once spooled how well the torque curve holds until redline. Power just continues to build from 600 wheel horsepower to 975 wheel horsepower. It almost reminds you of a classic M motor curve. List Of Modifications • Built Engine Stock Bore/Compression (CP Pistons/Carrillo Rods) • Headgames Motorworks Cylinder Head (Please Contact Headgames For Details) • ASR Engineering Intercooler • ASR Engineering Heat Exchanger • Intakes • Catless Downpipes • Dodson Sportsman Plus DCT Clutch Kit • Fuel-It PI • Stock Intake Manifold • Stock MAP Sensor • Maximum PSI Crank Hub Kit • BootMod3 • HCP Custom Tune • KRAS55Bi Turbo System (Standard Billet Wheel Option) • Pump Gas E85 (78% Via Fuel-It Sensor) Before people start criticizing for the lack of RPM on the axis: The important aspect to focus on here is how the Kratos KRAS55Bi turbo curve looks overlaid on the stock turbochargers. It is almost hard to believe how little loss in spool there is. Where is the big sacrifice for top end punch? There isn't one. The difference at redline is almost 500 whp over a tuned stock turbo setup with an ethanol blend. S55 engine pictured with Kratos inlets: It is important to focus on more than just peak figures. No doubt people will see quadruple digit numbers and the peak figure will get their attention but the area under the curve here on display here is unparalleled for the platform. They are delivering as promised and even exceeding expectations. Keep in mind these are the KRA55Bi ball bearing turbochargers and the titanium KRAS55Ti are still coming. So when will these be available? Well, you can get them next month and pre-orders will be honored first. Expect these to sell fast: PRESS RELEASE

Good to see some strong GT2 RS performance numbers but the dragstrip numbers tell you that magazines inflated GT2 RS performance figures. While MotorTrend has the GT2 RS Weissach package trapping 139 miles per hour in the real world it takes an ECU tune to get there. The previous record was 9.954 @ 141.43 but that was with the wing removed. As you can see in the video below, the new quicker pass was set with the wing in place. The fastest pass remains 141.43 but that would likely fall if this GT2 RS removed its wing as well. Beyond the tune the car is running race gas and catless downpipes. Regardless, 9.895 is the new quickest 1/4 mile elapsed time for the platform.

Yes, the B5 Audi S4 and RS4 are very old at this point but the car is a great used tuning value especially in the Audi sphere. There are a ton of parts available and all wheel drive paired to a turbo six-cylinder motor never goes out of style. Look at the difference between THE-tuner's design and the factory B5 manifold: Quite the difference right? Advantages over the original RS4 manifold: Larger and improved channel guidance Higher flow Uniform constant narrowing of the cross-section Larger modified plenum Streamlined position of the injectors Better fuel mixture formation Optionally selectable for RS4 or RS6 throttle valve They did not post any direct before/after data unfortunately but it is not hard to tell the new piece looks much more efficient.