TODOROKI™ VALVE RS Made-to-Order Equal-Length Mid-Pipe Cat-Back Valved Exhaust｜BMW M3 F80 / M4 F82/F83 (S55)

The S55 is a 3.0-litre twin-turbo straight-six — the M engine that preceded the S58, fitted to the M3 F80 and M4 F82. It combines a 7,600rpm limit with a rev-out that stays clean despite forced induction. The factory exhaust, though, is designed to deliberately suppress sound pressure through its silencers.The engine has the character, but the exhaust note alone falls short. This is the source of the first disappointment most owners notice on the F80 / F82.

The TODOROKI™ VALVE RS equal-length mid-pipe replaces everything downstream of the catalytic converterQuad-exit cat-back system.Equal-length Mid-pipebrings the exhaust from both sides together, and an electronically controlled valve switches the volume.Factory-equivalent quiet with the valve closed, and the S55's true top-end pull and volume when openrestoring it.

This productMade to orderThis is made to order. Once your order is confirmed, we build one unit exactly to your chosen specification.

The mid-pipe on the TODOROKI™ VALVE RS Equal-Length Mid-Pipe isEqual-length Design. From the collector after the catalytic converter through to the left and right silencers, the path lengths are matched. Unequal lengths mean the two sides arrive out of step and the note muddies as revs rise. Matching them puts the exhaust pulses in phase, and the sound stays clean all the way to the top.

This equal-length piping has no resonator or bends adding resistance.After aligning the pulse phase, it carries the exhaust to the centre silencer by the shortest route. This is the configuration.

If pure exhaust efficiency is your only goal, this is the most rational configuration.however, since the mid-pipe has no sound-damping element, the volume stays constant at all timesis a weakness here — whether driving through a residential neighbourhood or starting the engine early in the morning, the volume never changes.

The valved exhaust is what solves this.

• Valve closed: A quiet path that runs through the centre exhaust. Volume drops to near-factory levels, so it won't be an issue when driving in residential areas or starting the car early in the morning
• Valve open: The straight path opens up, maximising exhaust efficiency

Exhaust efficiency and quietness are normally a trade-off, but a design that switches the flow path itself lets you have both.Releasing the exhaust shaped by the equal-length design only when needed. Because the mid-pipe has no silencing structure by design, the difference between valve open and closed is larger.

This productElectronically controlled valve (remote-operated) as standard. If you'd like it changed to link with the factory valve, please contact us before purchase.

Whichever method you choose,Please be sure to let us know at the time of purchase. Specifications are locked in during production, so changes cannot be made afterward.

• Equal-length Mid-pipe: the left and right paths are matched in length. With the exhaust pulses in phase, the note does not muddy as revs rise but stays clean to the top. With no resonators or bends to add resistance, gas velocity is carried through to the centre silencer
• Silencer Internal Structure: packed with heat-resistant stainless wool and sound-absorbing fibre. Compared with ordinary glass wool it degrades far less under heat, so silencing performance holds up over the long term. The quiet you get with the valve closed rests on this internal structure
• Centre exhaust: A single silencer is positioned at the centre of the car. With the valve closed, exhaust routes through it for sound suppression; when open, it's bypassed
• Electronically controlled valve: switches the exhaust path just before the silencer. Closed, gas runs the quiet route through the silencer; open, it takes the straight path — so volume and character change together
• Quad-exit: Exhaust exits through four tips, two on each side. This configuration secures exhaust efficiency while achieving an appearance befitting an M model
• Cat-back Structure: The factory catalytic converter is left in place, replacing only the section downstream of it. As it uses the factory hanger positions, no modification to the vehicle is required

Fitment accuracy for an exhaust is determined by the actual car, not the drawings. For the TODOROKI™ F80 / F82 / F83 version,Designed from 3D scan data of an actual car's underbody. Factory hanger positions, floor geometry and clearance to the rear bumper aperture are all pinned down from measured values, so it fits without modifying the car.

Welding isFully TIG-welded at high temperature. The base material is SUS304 stainless steel at a full 1.5mm wall thickness. An exhaust takes heat and vibration continuously, so the quality of every joint is the durability of the system.

In the S55, two turbos each serve three cylinders. Gas leaving the left and right banks passes through separate turbines before flowing downstream.How the separately processed left and right exhaust streams are aligned and merged — this is what determines the sound quality. This is where equal-length design pays off.

A straight-six also fires at even intervals, so first- and second-order vibrations cancel each other naturally. Being able to raise sound pressure without touching that smoothness is the single biggest reason to pair a free-flowing exhaust with a straight-six. It draws out the S55's 7,600rpm ceiling in the one dimension the factory left on the table: sound.

The VALVE RS equal-length mid-pipe and the TITANIUMThe structure, valve mechanism, and fitment are all identical; the only difference is the material. If the weight saving, the change in note and the way the heat colouring develops over time are what you value, look at TITANIUM. STRAIGHT differs in the number of tips, so choose it on the basis of how you want the car to look.

RS is a grade designed around one standard: no compromise on price, quality, or sound.The silencer body features the TODOROKI™ logo. If we are going to put our name on it, it goes on every product regardless of price point. Costs that contribute nothing to performance or sound are not carried; that money goes into material, construction and the price.

Focusing exclusively on BMW lets us share jigs and validation processes across products, and reading demand chassis by chassis removes the losses that come with small-batch production. Optimising every stage — administration, manufacturing and shipping — is what makes this price possible.

TODOROKI™ is made to order, one car's worth at a time, in partnership with our production facility. Fabrication begins once your order is confirmed, and BIMMER+ selects and inspects every specification before dispatch.

• Customization available on request: We're happy to discuss exhaust specifications with you before purchase
• Volume direction can also be specified: We can accommodate requests such as "more sound with the valve open" or "quieter with the valve closed"
• Additional Charges: Additional charges may apply depending on the specification
• Prior consultation required: If you'd like customisation, please be sure to contact us before purchase
• Notes: Some customisations may not be available depending on production status or vehicle model

1. Tip finish
   • Choose from 7 options (the numbers correspond to the list in the product images)
2. Tip (exhaust tip) diameter
3. Exhaust Body Wall Thickness / Pipe Diameter
4. Valve control method
   • Electronically controlled valve / remote-operated (standard)
   • Linked to the factory valve (please let us know at the time of purchase)

• Body Material: SUS304 stainless steel
• Structure: Cat-back (replaces everything after the catalytic converter). 4 tips
• Mid-pipe: Equal-length design
• Wall thickness: 1.5mm
• Inside the Silencer: heat-resistant stainless steel wire plus sound-absorbing fibre
• Valve mechanism: Electronically controlled valve (remote-operated, standard) / factory valve linkage also available
• Welding: Fully TIG-welded
• Installation: Uses the factory hanger positions. A bolt-on design that requires no modification to the car
• Logo: TODOROKI™ logo on the silencer body

• Mid-pipe
• Centre exhaust
• Exhaust Tips (4 pieces)
• Valve controller, remote, and wiring
• Band clamp set

We are publishing actual exhaust-note recordings progressively as they become available for each model. If you're in a hurry, please use the contact form to"Vehicle model and chassis" and "sound sample request"Please include this when you contact us. For models we already have a sound sample for, we'll send it as is; for models still in preparation,We prioritise preparation for vehicle models based on customer requests.

BMW M3 F80 / M4 F82 & F83 (S55)Purpose-built design.

BIMMER+ organises its collections by chassis code. Search from your own chassis and only the parts that fit will appear. Model year, trim and prior modifications may mean some adjustment is needed at fitting, so please ask before you buy if anything is unclear.

The listed priceShipping, customs duties, and customs clearance fees are all included.There are no additional costs after the product arrives.

Exhausts are bulky and heavy, and shipping alone runs to around ¥20,000. Some sellers bill freight and domestic forwarding separately from the product price; BIMMER+ quotes one all-inclusive figure.

After your purchase, be sure to"Vehicle model / year / VIN" via our contact form. Even if you do not want any customisation, please still get in touch so we can identify your car.

Removing and fitting an exhaust requires specialist tools and a lift. We strongly recommend installation by a qualified workshop or specialist. Wiring for the valve controller is also involved, so if you are not confident about fitting it yourself, please use a professional.

On cars with a factory valve, removing it may trigger a warning light. If that happens, a canceller or similar solution will be required.

As these are built to order, shipping after order confirmation typically takes2–4 weeks. Customisation, production and logistics can push this beyond the stated period. If you are working to a deadline, talk to us before ordering.