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(T304 Stainless Steel or Grade 5 Titanium)
The S55 engine powering the BMW F8X M3 and M4 is a performance masterpiece, but its stock exhaust note has long been criticized for excessive rasp and a lack of tonal depth. The Valvetronic Designs Equal-Length Valved Cat-Back is the definitive solution—eliminating the factory harshness and unlocking the rich, balanced sound the S55 was always capable of producing.
This system features a 2.75-inch equal-length mid-section with an H-pipe feeding into a 3.5-inch axle-back. The equal-length design smooths the exhaust tone across the rev range while preserving the aggressive character owners love. With valves open, gases exit freely from the passenger-side tips for maximum volume and performance. With valves closed, flow is routed through our quad-chamber muffler to the driver-side tips for a quieter, more refined note—ideal for daily driving.
No cutting or welding is required—this is a true direct bolt-on system designed to mount to factory points.
Equal-Length Mid-Section: Balances pulses for a cleaner, smoother tone without losing aggression.
H-Pipe Design: Improves scavenging for a fuller, more refined sound.
Dual-Mode Operation: Raw and loud (open) or subdued and civilized (closed).
Valves Open: Aggressive, free-breathing tone with reduced rasp and improved high-rpm clarity.
Valves Closed: Stock-like sound levels for stealthy driving.
Electronic Valve Control: Includes standalone controller; OEM integration available.
Materials: T304 stainless steel or Grade 5 titanium.
Weight Savings: –21.7 lb (Stainless) / –49.2 lb (Titanium) vs. OEM.
Craftsmanship: Precision TIG welds and fully mandrel-bent tubing for maximum flow.
Tips: Multiple premium finish options to complement your M3 or M4.
2015–2018 BMW M3 (F80)
2015–2020 BMW M4 Coupe (F82)
2015–2020 BMW M4 Convertible (F83)
Direct bolt-on; no cutting or welding required.
100% reversible—return to stock at any time.
Note for S55 Owners: On free-flow/race downpipes, “2k rpm rasp” may be present during low-rpm shifts. For the most refined tone, we recommend high-flow (200 cell) catalytic converters.
2.75" equal-length H-pipe mid-section
3.5" axle-back with quad-chamber muffler
Electronic valve system with controller (OEM integration optional)
All necessary clamps and hardware
Mid-Section Diameter: 2.75" equal-length with H-pipe
Axle-Back Diameter: 3.5"
Material: T304 stainless steel or Grade 5 titanium
Valves: Electronic, rapid open/close
Weight Savings: –21.7 lb (Stainless) / –49.2 lb (Titanium) vs. OEM
Design: Quad-chamber muffler for refined closed-valve tone
Warranty Coverage
All products manufactured by Valvetronic Designs are guaranteed to be free from manufacturing defects in materials and workmanship at the time of sale. A manufacturing defect is defined as any characteristic of the product that arises during the manufacturing process which impairs its usability for the purposes for which it was designed and manufactured.
Products are guaranteed to fit and function as designed on their intended vehicle application, provided the vehicle has not been modified or incurred structural damage. Sound or tone is not a warrantable or returnable issue, as exhaust sound is subjective and not considered a defect.
Warranty Periods
Warranty Terms
Overall rating: 4.909091 / 5 from 33 reviews.
The BMW F8x M3 / M4 Equal Length Valved Sport Exhaust System enhances the S55 engine's performance by eliminating the stock exhaust's harshness and delivering a rich, balanced sound. It features an equal-length mid-section with an H-pipe and a 3.5-inch axle-back, offering a smoother tone and aggressive character. The system is a direct bolt-on with no cutting or welding required, providing a quieter, refined note when valves are closed.
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"This exhaust I read great things and watched plenty of videos about it so I decided to purchase it and I’ve had it on for about a week now and it’s the best purchase I’ve ever made. Made the car way better with the driving experience and I couldn’t ask for a better exhaust. Hope this exhaust lasts for as long as I keep this car and hopefully no issues but I would 💯 percent recommend this exhaust to every F8X owner as I think it’s the best exhaust on the market for sure."
"This exhaust will definitely have you smiling from ear to ear, the car is so much louder and with the click of a button can be quieter than stock! Definitely worth every dollar!"
"I wanted something sleek something that could be loud when wanted and quiet when wanted and this did that perfectly !"
"I got a full titanium exhust for my 2015 Bmw M4 and it was great. Instal was super easy and sounds amazing."
"I am absolutely loving the exhaust, it makes all the noise I’ve been wanting and needing. It’s got a nice sound and tone through the RPM ranges!"
"The exhaust for my F82 sounds so good. I’m glad I invested into one after a year of having my car."
"I absolutely love my Valvetronic exhaust. It sounds like a race car with the valves open and quiet when closed. Perfect for me. I run primary cats and Bootmod Stage 1. The exhaust is a work of art and a top-quality product that’s worth the cost. I can't wait to visit the Nürburgring and blast it down the Autobahn to see what it sounds like at full throttle. I'm running a Valvetronic exhaust with primary cats and Bootmod Stage 1, and I couldn’t be happier with the setup."
"Very Loud and Has a nice tone to it. I love it."
"Hands down this exhaust is the answer to what the F8X platform should've came like Stock from the factory!! If the F82 needed surgery, then this exhaust is the cure!! I have not had the opportunity to do photos and video shoots yet, but as soon as Spring comes and the next car show happens it will be shocking!! Thanks Valvetronic, your exhaust is the Savior for the sinful sounds of the F8X platform!!"
"For a expensive exhaust I wish it didn’t make a rasp around the 2k-3k RPM mark. Anything past the 2/3k RPM, my car sings to high heaven and it screams so good 😮💨 I will be getting a resonated downpipe and hopefully it fixes the raspiness."
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