Ex-Demo BMW M3 / M4 (G80 / G81 / G82 / G83) | Slip-On Line (Akrapovic)
Akrapovič is the global leader in high-performance exhaust systems, proudly designed and manufactured in Slovenia. Renowned for their unmistakable sound, race-proven engineering, and commitment to innovation, Akrapovič is trusted by top manufacturers, motorsport teams, and drivers worldwide. A materials technology company at its core, Akrapovič invests extensively in research and development to deliver a deep, rich exhaust note alongside improved performance and reduced weight.
Akrapovic Performance Exhaust — S-BM/TI/33H
The Akrapovič Slip-On Line (Titanium) is a precision-engineered exhaust system that brings out the true character and performance of the G80 / G81 BMW M3 and G82 / G83 BMW M4. Crafted entirely from lightweight titanium, this system is designed to enhance every aspect of the driving experience—from sound and performance to weight savings and aesthetics. More than just an exhaust, it’s the finishing touch the M3 / M4 deserves and how it should have come from the factory.
Sound
The Slip-On Line transforms the BMW M3 / M4’s exhaust note, unlocking its true character. At cruising speeds, the system delivers a smooth, refined tone, while acceleration produces a deeper, more aggressive growl that perfectly complements the car’s sporty nature. Enhanced natural overrun provides controlled pops and burbles, adding excitement to every gear change. With the advanced Akrapovič Control Kit regulating exhaust flow and tailoring the sound profile, the system ensures precise sound management in all driving conditions, all while eliminating intrusive droning.
Performance
Designed to optimise performance, the Slip-On Line (Titanium) delivers measurable gains that elevate the driving experience of the BMW M3 and M4. Its freer-flowing exhaust design reduces back pressure, improving gas flow and enabling the engine to respond more efficiently. Akrapovič’s dyno testing confirms a power increase of +10.9 hp at 6,000 rpm and +10.3 ft-lb of torque at 5,000 rpm, resulting in sharper throttle response and stronger acceleration. The system also reduces weight by 8.3 kg—35% lighter than the stock exhaust, improving agility, cornering precision, and overall handling. These benefits are achieved without the need for ECU remapping, ensuring seamless installation and compatibility with the factory setup of the M3 and M4.
Design
The Slip-On Line is as visually striking as it is functional. Featuring a smaller, sleeker back box, it replaces the bulkier standard unit with a design that is cleaner, lighter, and more purposeful. Akrapovič’s attention to detail is evident in every element, with components such as the valve housings and collectors cast in their in-house titanium foundry, ensuring durability and precision.
Two tailpipe designs are available: a bold octagonal option with carbon fibre outer sleeves or a classic cylindrical style. Both add a premium, motorsport-inspired finish while reducing overall weight, perfectly complementing the M3/M4’s aggressive styling.
Modern emissions and noise regulations often stifle the sound and performance of today’s sports cars. Akrapovič’s Slip-On Line addresses this head-on, restoring the visceral sound and responsiveness that define the BMW M3/M4 as true driver’s cars. Designed and built for seamless integration, this is a hardware upgrade with no compromises.
Compliance, Compatibility, and Warranty
The Akrapovič Slip-On Line (Titanium) is fully ECE type-approved, ensuring compliance with emissions and noise regulations for road use. No ECU remapping is required, ensuring seamless integration with the vehicle’s existing systems.
Warranty: Backed by Akrapovič’s 2-year product warranty.
The Avon Tuning G81 M3 with Akrapovic Exhaust System! Have you been wanting some noise for your M3 or M4? Well, check out what we have done to ours!
After months of development and testing on the S58 platform, Akrapovic released the Slip-On-Line for the M3 (G81) to the market.
Click HERE to see more!
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T&C's
T&C's
All purchases on this website our subject to our Terms and Conditions. Please ensure you have read and understood these before making a purchase. If you have any questions, please feel free to contact us and we will endeavour to answer any questions you may have.
PLEASE BE AWARE: Sports cats can NOT legally be installed on a vehicle for use on a public road that was manufactured after 1st March 2001 unless type ECE 103R approved - this can be identified in either the product description and/or in the Technical Information section listed. If you have any doubt on this approval, please contact us immediately for confirmation. Fitting a De-Cat/Cat Bypass, DPF delete/bypass or GPF delete/bypass to a vehicle that is to be used on UK roads will cause the vehicle to fail the MOT emissions test, therefore rendering it unroadworthy and illegal to be used on the road. Therefore, any such products are strictly sold as off-road or motorsport use only and NOT for road use. The vehicle should be transported from place to place via a trailer, flatbed or other recovery means.
Stock Availability
Stock Availability
Due to the high volume of custom orders and special requests we receive daily, it’s not always possible to have every item readily available in our warehouse at all times. While we strive to maintain stock for popular products, some items may require additional processing time. If you need a product urgently, we highly recommend reaching out to our sales team here before placing your order to confirm availability and estimated delivery times.
Please Note:
- Orders with both in-stock and backorder or out-of-stock products will be dispatched once all products are available to ship together.
- Contact our sales team if you want your parts fitted to your vehicle at our Bristol Headquarters.
- Shipping estimates are based on courier delivery times and don't include time to despatch.
Delivery & Returns
Delivery & Returns
At AT Store, we understand the importance of timely delivery when it comes to your orders. Our goal is to have your products shipped on the same day we receive your order. We prioritise efficiency and strive to provide you with a seamless delivery experience.
Same-Day Shipping
We aim to dispatch your orders promptly to ensure minimal waiting time for our customers. Orders received before 15:00 (GMT) on business days will typically be processed and shipped on the same day. Orders received on weekends/holidays will be processed on the next business day.
Communication on Delays
While we make every effort to ship your orders promptly, there may be unforeseen circumstances or stock availability issues that could cause delays. In such cases, a dedicated member of our sales team will personally reach out to you to inform you of any delays and provide updates on the status of your order.
Akrapovic Products Lead Time
Please note that for Akrapovic products, there may be a lead time of up to 10 working days depending on current stock levels. Our team will inform you promptly if your order falls within this category and provide you with an estimated delivery date.
Tracking Information
Once your order has been dispatched, we will provide you with a tracking number via email. Additionally, the tracking number will be added to your order notes on our website. This allows you to easily track the progress of your delivery and stay informed about its whereabouts until it reaches your doorstep.
International Shipping
We now calculate international shipping costs separately to ensure the most accurate and competitive rates. If you’re placing an order from outside the UK, please contact us for a shipping quote before completing your purchase. Our team will provide you with the best available options tailored to your location.
We are committed to providing you with the best possible delivery service, ensuring that your orders reach you in a timely manner and in pristine condition. If you have any questions or concerns regarding our delivery process, please don't hesitate to contact us for assistance.
For information regarding Returns, please refer to our T&C's.
Email: Store@avontuning.co.uk
Phone: 01454 800 117
Online we currently accept payment from the methods listed above including a wide range of finance options.
Finance Options
In order to get the kit you want, when you need it, without ruining the family finances we offer a highly flexible range of finance options to help you get the best products on your vehicle now rather than at the end of the season when you've saved up the cash to make the purchase. There are even interest free options which effectively spread the cost without costing you any extra.
Avon Tuning Limited is an Introducer Appointed Representative of Social Money Limited t/a Payl8r who is authorised by the FCA under Ref. Number 675283. Credit is subject to creditworthiness and affordability assessments. Missed payments may affect your credit file, future borrowing and incur fees.
What Our Customers Are Saying
Mark W.
“Thanks to James and Marcus at Avon Tuning for arranging and fitting a Quicksilver exhaust to my new Defender V8. Everything went like clockwork and it sounds awesome”
Paris C.
"Would highly recommend Avon Tuning. They're extremely knowledgeable, outstanding customer service - we even had a lovely courtesy car for the few hours they had ours. You're in good hands with Avon Tuning!"
Richard N.
"I’d give 6 stars if they’d let me! Avon Tuning did the most fantastic job. I arranged everything with James at the beginning and he was so helpful, guiding me to the correct exhaust system (Miltek) and a Stage 1 Remap"
Peter B.
"Amazing service from James and the team at Avon Tuning.Fitted a new exhaust system on my Aston Martin Vantage, not only does it sound and look great but it puts smiles per miles for me."
