Stage 2 Chassis Reinforcement Kit | Gen 1 MINI | R52S & R53S

For the ultimate MINI Performance enthusiast M7 Tuning has bundled the final two pieces needed to transform your MINI from a go-kart into an F1 turning machine. If you already have the M7 Strut Tower Brace, this bundle is for you. Add these industry leading bolt-on MINI Cooper suspension components and WOW! instant grip like you have only imagined in your dreams. In this Stage II Bundle we have packaged our exclusive Under Strut System AND the M7 Rear Chassis Brace for the R53 Mini Cooper.

One of the biggest improvements you can make to gain grip is stiffening your chassis. A stiffer chassis allows the suspension, like the springs, shocks and sway bars to work more effectively and do their job as intended; keeping the tires in better contact with the road. The M7 Under Strut System (USS) and Rear Chassis Brace feature easy to install integrated billet and extruded aluminum pieces that will brace, connect, and triangulate your MNI Cooper chassis for greatly improved chassis stiffness. Make maximum grip, increase steering response and reduce understeer during aggressive turn-in or emergency maneuvers.  This is a "WOW! Why didn't I do this sooner?" addition to your favorite speed monster.  Buy the best, buy the original…you will not be disappointed! Easy to install. M7 Tuning products are Engineered, Tested & Proven to PERFORM!

Under Strut System

Not many upgrades will force you to say, "damn that's incredible" or just plain "wow." The M7 Under Strut System (USS) features three integrated pieces that will brace, connect, and triangulate the bottom of the chassis for greatly improved chassis stiffness. This improved stiffness will give the MINI better turn-in capability allowing the car to rotate into the corners with ease, and also greatly reduce understeer.The M7 Under Strut System is made of extruded and CNC machined aluminum that comes in a black anodized finish that iss durable and designed to prevent chipping and corrosion. Stainless steel fasteners and necessary tools for nut insert installation are all included! We'd say our months of rigorous testing at local race tracks, treacherous canyon roads and sweeping on/ off-ramps, were a good investment - you'll say the same thing about the M7 USS.

Installation Notes: If you are not using a lift, please be sure that you have enough room so you can drill square (perpendicular)to the underbody. We cannot stress enough how important this is. Drilling at an angle will cause the hole for the nut insert to be too large for proper installation. Please do NOT attempt to install your USS on a slanted driveway. Note: There may be fitment issues on some applications with the Milltek and Alta exhaust systems. 

Rear Chassis Brace

During hard cornering, the MINI is prone to chassis flex that results in poor handling characteristics and the need for the driver to compensate. M7 now offers a way to fix this problem with the M7 Rear Chassis Brace (RCB), one of the additions to the M7 Suspension Solutions line. This modification is perfect for people who want ultimate chassis stiffnes but with adding an intrusive rool bar or roll cage.

Our first installed system impressed the customer so much that he was inspired to call back within 20 minutes of leaving our office with reports of how the brace instantly changed his car's traits. He described how the rear end of the car felt heavier and more planted to the ground, and any kind of fishtailing effect felt done away with. Overall the handling of the car felt tighter and more responsive to the driver's commands.

The M7 Rear Chassis Brace is a great compliment to the immensely popular M7 Under Strut System (USS). Using the two together will give you the best in chassis stiffening without going the route of a roll cage.

Besides the benefit of more predictable handling, the Rear Chassis Brace allows for comfortable use of the rear seats. Unlike a roll cage, there are no harness bars or cross members to remove to allow access to the rear seats. The position of the rear seats is also unaffected!

Going another step further, with some minor modifications you can mount a fire extinguisher or other accessory equipment (not included) to the RCB. As many weekend track warriors find out, a fire extinguisher is often required by driving event coordinators. By attaching the fire extinguisher to the RCB, you can meet the organization's requirements and have safe and easy access to the fire extinguisher if the need for it arises. This eliminates the need to drill into the floor of the car or worry about not having a roll cage to mount the fire extinguisher. Since fire extinguishers mounted to the RCB are in the boot of the MINI, all passenger space is STILL unaffected by installation and use of the RCB.

Handling without sacrifice of passenger comfort, and a place to mount a fire extinguisher...the M7 Rear Chassis Brace is the perfect addition to the street MINI that sees the track as well.

Optional RCB Accessory Plates. Easily place and remove these lightweight plates that can hold anything you want to mount on them. Data acquisition systems, first aid kits, emergency supplies...anything! A great addition for mounting all your cool stuff without drilling into floors and interior panels. Easy in and out for quick track-to-street and street-to-track conversion

Please Note: The RCB currently fits the R53 Hatchback only.