ModStock - Exhaust mods

ModStock - Exhaust mods Exhaust modification, ECU/TCU Remapping, coding, suspension, race brakes, fast road and motorsport 😎🔥🔧

30/05/2026

Upgrade Your F8X M3/M4 with the All-New Modstock Equal Length Midpipe

Transform the sound and character of your BMW F80 M3 or F82/F83 M4 with Modstock’s brand-new Equal Length Midpipe. Specifically engineered for the F8X platform, this premium exhaust upgrade delivers the iconic equal length exhaust note, improved exhaust flow, sharper throttle response, and a more engaging driving experience.

Designed to bring out the best of the S55 engine, our Equal Length Midpipe produces a smoother, more exotic tone while maintaining excellent fitment and build quality.

Choose Your Sound

🔥 Resonated Rear SectionEnjoy a deeper, smoother exhaust note with reduced drone and a refined tone that’s perfect for daily driving and long journeys.

🔥 Non-Resonated Rear SectionUnlock a louder, more aggressive exhaust note with maximum volume, enhanced turbo sound, and a more race-inspired driving experience.

Engineered for Performance

Our Equal Length Midpipe is designed to optimise exhaust flow and improve gas scavenging, helping to create a more balanced exhaust pulse and the distinctive sound that F8X owners love. The result is improved responsiveness, enhanced driving enjoyment, and a richer S55 soundtrack throughout the rev range.

Why Choose Modstock?

✔ Precision-engineered for the BMW F8X M3/M4 platform✔ Signature equal length exhaust tone✔ Premium-quality materials and OEM+ fitment✔ Choice of resonated or non-resonated rear sections✔ Compatible with stock and aftermarket exhaust systems

Professional Installation Options

We offer a range of convenient fitting services to suit your needs:

🔧 In-House Workshop Installation🚐 Mobile Workshop Service🏠 Driveway Fitting Service – professional installation at your home

Worldwide Shipping Available

No matter where you’re located, we can ship your new Equal Length Midpipe directly to your door, with professional fitting services available for customers who want a seamless installation experience.

Experience the sound the S55 should have had from the factory with Modstock’s latest Equal Length Midpipe.

Order yours today and discover the perfect balance of performance, sound, and drivability.

Audi RS5 in for our inserted sports cats this week 😎🔥🔥
29/05/2026

Audi RS5 in for our inserted sports cats this week 😎🔥🔥

28/05/2026

BEAST MODE ACTIVATED!! Gen 2 Audi R8 V10 now running our Back Box Mod and Remote Valve Controller 😎😈😮‍💨 LETS GO!!

28/05/2026

V10 R8 in today , keep an eye on our socials to see the results later on today 😎

27/05/2026

Valves open = BEAST MODE😈…. Then valves closed our mods sound completely stock 😎 Best of both worlds!! V8 R8 with our back box mod 😮‍💨 LETS GO!

26/05/2026

V6 F-type inserted sports cats 😎😎 drop us a DM for more info!

26/05/2026

🔥 BMW E9X M3 Back Box Mod – ONLY £360 🔥

Unleash the true sound of the legendary S65 V8 with a Modstock Exhaust Modifications back box upgrade for the:

• BMW E90 M3
• BMW E92 M3
• BMW E93 M3

Sound options available:

🔹 1.5 Pipe Mod – Subtle / Moderate
🔹 1.75 Pipe Mod – Moderate / Medium
🔹 2 Pipe Mod – Medium / Loud
🔹 2.5 Pipe Mod – Loud / VERY Loud
🔹 4 Pipe Mod – Full ASBO Spec 😈

These mods completely transform the sound of your M3 at a fraction of the cost of a full custom exhaust system.

✅ OEM fitment
✅ Proper V8 tone
✅ No cheap rasp
✅ Mobile fitting available
✅ Aftermarket & modified tips available
✅ Trade-in available on your OEM back box

💰 ONLY £360

If you’ve watched the videos online, you already know how good these sound — but hearing one in person is a completely different experience.

📩 Message Modstock Exhaust Modifications to book your slot.

24/05/2026

Unlock the full potential of your BMW G8x M3 & M4 with ModStock CS Software Coding – the ultimate upgrade for performance, sound, and driving dynamics.
Our G8x CS coding packages are designed to enhance your vehicle with genuine CS-level software characteristics, delivering sharper throttle response, improved power delivery, refined burbles, and a more engaging driving experience while maintaining OEM safety and reliability.
CS Power Upgrade Package – £180 + VAT
Includes enhanced power mapping, optimised burble settings, and refined CS exhaust character for a true CS-inspired feel.
CS Dynamics Package – £120 + VAT
Upgrade your traction control, steering calibration, differential behaviour, and gearbox logic for improved handling, faster gear shifts, and superior road and track performance.
OPF Coding – £180 + VAT
Optimises exhaust flow and overall driving response for a sharper, more responsive feel.
Why choose ModStock?
• BMW G8x coding specialists
• Safe OEM-style CS software enhancements
• Improved drivability and performance balance
• Professional diagnostics and precision coding
Flexible Installation Options
We can carry out your G8x CS software coding in-house at our workshop or remotely, offering a fast and convenient solution wherever you are.
Compatible with G80 M3, G81 M3 Touring, G82 M4, and G83 M4 models.
Upgrade to the CS driving experience today with ModStock – precision BMW coding you can trust.

23/05/2026

MERCEDES S500 in this week for our Exhaust Mods 😎, drop us a DM and get booked in 😎🔥🔥

23/05/2026

DEDICATED DRIVEWAY SERVICE!! here’s how it works 😎😎😎😎😎

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