Owners review of the best tried and tested modifications for the G90 G99 M5.
The Pros and Cons of each modification.
We documented the entire process on our YouTube channel.
The ultimate modifications for the G90 and G99 M5
The arrival of the BMW G90 M5 and G99 M5 Touring marks a new era of high-performance luxury. While it boasts impressive power and sophisticated design straight from the factory, the desire to personalise and elevate this already exceptional machine is a natural inclination for many enthusiasts. At AUTOID, we understand this perfectly. That's why we've compiled our top 5 mods for the G90 M5, focusing on enhancing its performance, aesthetics, and overall driving experience. Whether you're looking for more power, a more aggressive stance, or a more exhilarating soundtrack, these upgrades are designed to take your G90 M5 G99 M5 Touring to the next level.
1. Plug-In Tuning Box by TDI Tuning
The TDI Tuning Plug-In Box offers a straightforward and reversible method to extract more power and torque from your BMW G90 M5 engine. This external module intercepts and optimises engine signals, leading to significant performance gains without requiring permanent ECU modifications. It provides various user-selectable maps, allowing you to tailor the power delivery to your driving style and conditions.
Working alongside TDI tuning we used our G90 M5 to test out their first plug-in tuning box which increased the output to an impressive 849HP & 1,242Nm of torque.
Pros
✅ Significant increase in horsepower and torque.
✅ Reversible installation, leaving the factory ECU untouched.
✅ Multiple user-selectable driving modes for tailored performance.
Cons
✖ Performance gains may vary depending on driving conditions and fuel quality.
✖ Potential impact on manufacturer warranty (check with your dealer).
✖ Relies on external module rather than direct ECU remapping.
2. Carbon Fibre Body Kit by TRE
The TRE PR-1 Carbon Fibre Body Kit for the BMW G90 M5 is a meticulously crafted aerodynamic enhancement package. Constructed from lightweight and strong pre-preg carbon fibre, this kit typically includes a three piece front splitter, front bumper duct extensions, side skirts, rear spoiler, three piece rear diffuser. These components are designed to not only elevate the M5's visual aggression with a motorsport-inspired aesthetic but also to potentially improve aerodynamic efficiency and downforce. The precision fitment ensures seamless integration with the G90's original design.
Working alongside TRE, we quickly got to work on designing a full pre-preg carbon fibre body kit for the G90 M5. With over 6 months in development to ensure optimal fit and finish.
Pros
✅ Enhances the vehicle's aesthetic with a more aggressive and sporty appearance.
✅ Lightweight carbon fibre construction can improve handling.
✅ Potential for increased downforce and aerodynamic efficiency.
Cons
✖ High cost associated with premium carbon fibre components.
✖ Installation may require professional expertise for optimal fitment.
✖ Carbon fibre can be susceptible to damage from impacts.
3. Lowering Springs and Spacers Stance Kit
This OEM Stance Kit provides a balanced approach to improving the BMW G90 M5's handling and visual presence. It includes a set of cobra suspension lowering springs, designed to reduce the ride height and lower the car's centre of gravity for enhanced cornering performance and a more aggressive stance. Complementary Bimecc wheel spacers are included to widen the vehicle's track, pushing the wheels out to fill the arches for a more planted and assertive look. This combination aims to improve both aesthetics and driving dynamics while maintaining a level of ride comfort suitable for daily driving.
Pros
✅ Improves handling and reduces body roll.
✅ Enhances the vehicle's stance by eliminating wheel gap and widening the track.
✅ Utilises the sophisticated OEM electronic dynamic control.
Cons
✖ May slightly compromise ride comfort compared to the stock suspension.
✖ Can potentially increase wear on other suspension components.
✖ Requires professional installation and wheel alignment.
4. Milltek Exhaust System
The Milltek Sport exhaust system for the BMW M5 G90 is engineered to significantly enhance the car's auditory experience. Constructed from high-quality stainless steel, this system is designed to provide a deeper, more aggressive, and sportier exhaust note compared to the factory setup. While the primary focus is on sound improvement, Milltek exhausts can also offer optimised exhaust flow, potentially leading to minor gains in horsepower and torque. Various tailpipe options are usually available, allowing for a personalised visual touch to the rear of the vehicle.
Pros
✅ Significantly improves the exhaust sound, providing a more engaging driving experience.
✅ High-quality stainless steel construction ensures durability.
✅ Potential for minor performance gains due to optimised exhaust flow.
Cons
✖ Can be a significant financial investment.
✖ Increased exhaust volume may not be suitable for all environments.
✖ Installation may require professional fitting.
5. Eventuri Intake
Eventuri is renowned for producing high-performance air intake systems that combine advanced engineering with stunning aesthetics, utilising carbon fibre construction. For the BMW G90 M5, the upcoming Eventuri intake is expected to be no exception. Designed to optimise airflow to the engine, increasing horsepower and torque, as well as improving throttle response. The signature Eventuri design incorporates a unique Venturi filter housing to ensure smooth and efficient airflow. The use of carbon fibre will not only contribute to weight reduction but also add a premium and sporty visual element to the engine bay.
Pros
✅ Increased horsepower and torque.
✅ Improved throttle response and engine sound.
✅ Premium carbon fibre construction enhances engine bay aesthetics and reduces weight.
Cons
✖ Comes with a premium price tag.
✖ Installation may require some technical expertise.
✖ Actual performance gains may vary.
Will these modifications affect my warranty?
We recommend speaking to the dealer you purchased your G90 G99 M5 from to find out their terms and conditions on modifications before hand.
Why Choose AUTOID for your G90 G99 M5?
Modifying your new G90 or G99 M5? AUTOID is your go-to for premium styling upgrades that blend perfectly with BMW’s factory design. Built by enthusiasts, our range includes gloss black and carbon fibre grilles, splitters, diffusers, and mirror caps—crafted from high-quality materials for flawless fitment and lasting durability. With an OEM+ design ethos, easy installation, and trusted customer service, AUTOID helps you personalise your M5 with confidence.
Can AUTOID install these modifications?
Yes we offer a professional fitting service on all parts sold on our store at our HQ in Chelmsford, Essex. Get in touch for a quote today.
Elevate Your G90 & G99 M5 Today!
Ready to take your G90 or G99 M5 to the next level? At AUTOID, we offer a curated range of premium styling and performance upgrades designed to help you personalise your M car like never before. Whether you're after sleek carbon fibre enhancements, improve the stance, or intake and exhaust upgrades, our collection is built to deliver OEM-level fitment with a unique edge. Don’t settle for standard—explore the full potential of your M5 and make a statement every time you drive. Browse our complete G90 / G99 M5 modification collection now and transform your M car today.
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