$2500 - $5000

As engine output climbs, the transmission becomes the weak link. RennTech's Valve Body Upgrade for the 2004-2010 CLK 63 AMG Black Series is a mechanical rebuild and upgrade of the clutch packs, adding friction material so more torque goes through each gear without slipping.Watch...

RennTech's 82 mm throttle body for the 2004-2010 CLK 63 AMG flows about 22% more air than stock. The billet aluminum housing bolts on with no changes to the intake manifold and sharpens throttle response along with a small power gain.Features 82 mm bore,...

RennTech headers for the 2004-2010 CLK 63 AMG are hand built from mandrel-bent, seamless T-304 stainless tubing with CNC-machined flanges, then ceramic coated to keep heat out of the engine bay. They bolt straight to the factory downpipes. RennTech measures the gain at about...

RennTech headers for the 2004-2010 CLK 55 AMG are hand built from mandrel-bent, seamless T-304 stainless tubing with CNC-machined flanges, then ceramic coated to keep heat out of the engine bay. They bolt straight to the factory downpipes. RennTech measures the gain at about...

RennTech headers for the 2004-2010 CLK 550 are hand built from mandrel-bent, seamless T-304 stainless tubing with CNC-machined flanges, then ceramic coated to keep heat out of the engine bay. They bolt straight to the factory downpipes. RennTech measures the gain at about 11...

The RennTech R1 Performance Package for the 2016-2020 GLE 63 AMG combines parts that RennTech developed and tested together, so you get a matched setup rather than a pile of separate upgrades. RennTech rates the GLE 63 AMG at up to 696 hp and...

If you want more from the 2016-2020 GLE 63 AMG without touching the hardware, this RennTech ECU+ Upgrade is the cleanest way to get it. RennTech revises the factory calibration for the 5.5L M157 twin-turbo V8, raising power and torque through the full band...

The 2005-2010 SLR McLaren responds well to software, and RennTech has been writing engine calibrations since electronic engine management arrived in the mid-1980s. This HHT ECU Upgrade rewrites ignition timing, throttle mapping, fueling and boost control on the 5.5L M155 supercharged V8, so the...

RennTech's 82 mm throttle body for the 2006-2011 CLS 63 AMG flows about 22% more air than stock. The billet aluminum housing bolts on with no changes to the intake manifold and sharpens throttle response along with a small power gain.Features 82 mm bore,...

RennTech headers for the 2006-2011 CLS 63 AMG are hand built from mandrel-bent, seamless T-304 stainless tubing with CNC-machined flanges, then ceramic coated to keep heat out of the engine bay. They bolt straight to the factory downpipes. RennTech measures the gain at about...

Heat soak is the enemy of a supercharged or twin-turbo Mercedes. RennTech's second-generation intercooler pump for the 2006-2011 CLS 55 AMG Kompressor flows 8.7 GPM at 11.6 PSI, against about 3.0 GPM from the factory pump, for cooler, denser charge air.Features Flows 8.7 GPM...

The RennTech R1 Performance Package for the 2006-2011 CLS 55 AMG Kompressor combines parts that RennTech developed and tested together, so you get a matched setup rather than a pile of separate upgrades. It includes ECU Upgrade Crankshaft Pulley and Upgraded Intercooler Pump. RennTech...

RennTech headers for the 2006-2011 CLS 55 AMG Kompressor are hand built from mandrel-bent, seamless T-304 stainless tubing with CNC-machined flanges, then ceramic coated to keep heat out of the engine bay. They bolt straight to the factory downpipes. RennTech measures the gain at...

RennTech headers for the 2006-2011 CLS 550 are hand built from mandrel-bent, seamless T-304 stainless tubing with CNC-machined flanges, then ceramic coated to keep heat out of the engine bay. They bolt straight to the factory downpipes. RennTech measures the gain at about 11...

RennTech headers for the 2006-2011 CLS 500 are hand built from mandrel-bent, seamless T-304 stainless tubing with CNC-machined flanges, then ceramic coated to keep heat out of the engine bay. They bolt straight to the factory downpipes. RennTech measures the gain at about 15...

Brakes matter as much as power on a fast Mercedes. RennTech's Brake Package 2 for the 2002-2018 G 55 AMG Kompressor upgrades rotors, calipers, lines and pads as one system for firmer pedal feel and less fade than stock.Features Multi-piston performance calipers Braided stainless...

RennTech packages its most popular upgrades for the 2002-2018 G 55 AMG Kompressor into one matched R1 Performance Package. Each part is calibrated to work with the others on the 5.5L M113 supercharged V8. It includes ECU Upgrade, Crankshaft Pulley and Upgraded Intercooler Pump....

If you want more from the 1990-2018 G 63 AMG BiTurbo without touching the hardware, this RennTech ECU Upgrade is the cleanest way to get it. RennTech revises the factory calibration for the 5.5L M157 twin-turbo V8, raising power and torque through the full...

Brakes matter as much as power on a fast Mercedes. RennTech's Brake Package 2 for the 1990-2018 G 500 upgrades rotors, calipers, lines and pads as one system for firmer pedal feel and less fade than stock.Features Multi-piston performance calipers Braided stainless brake lines...

The 1990-2018 G 65 AMG responds well to software, and RennTech has been writing engine calibrations since electronic engine management arrived in the mid-1980s. This ECU Upgrade rewrites ignition timing, throttle mapping, fueling and boost control on the 6.0L M279 twin-turbo V12, so the...

The RennTech R1 Performance Package for the 2017-2019 GLS 63 AMG BiTurbo combines parts that RennTech developed and tested together, so you get a matched setup rather than a pile of separate upgrades. RennTech rates the GLS 63 AMG BiTurbo at up to 696...

RennTech built its name in Florida tuning high-performance engines, and this ECU+ Upgrade for the 2017-2019 GLS 63 AMG BiTurbo is the result of in-house dyno development on the 5.5L M157 twin-turbo V8. Timing, throttle, air-fuel and boost tables are revised as one calibration,...

RennTech's 82 mm throttle body for the 2006-2011 ML 63 AMG flows about 22% more air than stock. The billet aluminum housing bolts on with no changes to the intake manifold and sharpens throttle response along with a small power gain.Features 82 mm bore,...

RennTech headers for the 2006-2011 ML 63 AMG are hand built from mandrel-bent, seamless T-304 stainless tubing with CNC-machined flanges, then ceramic coated to keep heat out of the engine bay. They bolt straight to the factory downpipes. RennTech measures the gain at about...

RennTech packages its most popular upgrades for the 2012-2015 ML 63 AMG BiTurbo into one matched R1 Performance Package. Each part is calibrated to work with the others on the 5.5L M157 twin-turbo V8. RennTech rates the ML 63 AMG BiTurbo at up to...

If you want more from the 2012-2015 ML 63 AMG BiTurbo without touching the hardware, this RennTech ECU+ Upgrade is the cleanest way to get it. RennTech revises the factory calibration for the 5.5L M157 twin-turbo V8, raising power and torque through the full...

If you want more from the 2016-present GLC 63 AMG, S without touching the hardware, this RennTech ECU+ Upgrade is the cleanest way to get it. RennTech revises the factory calibration for the 4.0L M177 twin-turbo V8, raising power and torque through the full...

RennTech built its name in Florida tuning high-performance engines, and this ECU+ Upgrade for the 2016-2020 GLE 63 AMG SUV is the result of in-house dyno development on the 5.5L M157 twin-turbo V8. Timing, throttle, air-fuel and boost tables are revised as one calibration,...

The RennTech R1 Performance Package for the 2010-2016 E 63 AMG, S BiTurbo combines parts that RennTech developed and tested together, so you get a matched setup rather than a pile of separate upgrades. RennTech rates the E 63 AMG, S BiTurbo at up...

Heat soak is the enemy of a supercharged or twin-turbo Mercedes. RennTech's second-generation intercooler pump for the 2010-2016 E 63 AMG BiTurbo flows 8.7 GPM at 11.6 PSI, against about 3.0 GPM from the factory pump, for cooler, denser charge air.Features Flows 8.7 GPM...