[Dinan_Engineering]

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Dinan G8x M3/M4 Axle Back Exhausts & Middle Exhaust / X-Pipe

Part Number: D660-0093, D660-0093-BLK & D660-0094

Applications:

• 2021-2023 G80 M3 (& xDrive)
• 2021-2023 G82/G83 M4 (& xDrive)

Product Page(s) / Pricing:
Axle Back Exhausts: dinan.info/G8X-FFE
Middle Exhaust / X-Pipe: dinan.info/G8X-X

Release Date: Available Now!

Description (G8x Axle Back Exhausts): The G8x M3/M4 is arguably superior in every category to its predecessor but in most, if not all, circles the biggest downfall of the platform is in the sound department. Like the F8x before it with the S55, the S58 in the current generation leaves a lot to be desired. While a step in the right direction from its forerunner the stock vocals still carry far too much rasp that do not fully articulate the refined aggressiveness typical of the brands signature performance models. Dinan corrects this weakness with a valved axle back exhaust system that elevates the tone to a deeper, more meaningful note while also delivering an extra level of amplification above and beyond its stock counterpart. Coupled with the optional middle exhaust / x-pipe for the platform an even louder, smoother, and fuller soundtrack is possible.

Through extensive development and testing nearly every possible permutation of the exhaust was attempted. Unlike the previous generation where cabin sound/drone was largely unchanged between the sedan and the coupe, that was not the case with the G8x chassis’. This caused countless iterations to be attempted in the quest for a common system that not only sounded superb externally but one that also didn’t introduce an overbearing internal cabin drone on either body type. The result is a system we are confident will be coveted by all for years to come. To achieve desired sound volume and tone worthy of the G8x M3/M4 the tubing was enlarged to 76mm (vs 70mm stock) to allow freer flow, and reduce backpressure, throughout the entirety of the system. The larger piping gives way to multiple pathways as it nears the rear of the vehicle -- the choice of which is utilized determined by the factory exhaust valves which are retained. When valves are closed, flow is directed into the Dinan muffler, where absorption and reactive technologies are used, and exit out the two inner tips. This limits noise during low-speed driving and produces a more subdued, albeit deeper, and agreeable note. However, when the valves are open during high-load conditions the bulk of the gases bypass the muffler altogether for a near straight pipe design and maximum aural enjoyment to be achieved. It’s the perfect marriage for all tastes and allows civility or impassioned aggression depending on what the situation demands. The combination is one Dinan has deemed fitting for the marques signature performance models that cater to the tasteful enthusiast who demand the best for all situations.

Visually, the Dinan G8x M3/M4 exhaust has been skillfully crafted entirely out of T304 stainless steel and TIG welded for the best visual appearance and color. The entire system is then brush finished to further guarantee an immaculate looking system out of the box. The attention to detail is not limited to parts of the system you can't see once the exhaust is installed but is also extended to the exhaust tips themselves. The Dinan exhaust includes massive, quad 4.5-inch (114mm) clamp-on, double-walled, polished stainless steel (or coated black ceramic) and laser engraved exhaust tips. Despite the seemingly cartoonish size on paper, the tips mesh seamlessly and fill the factory cut-outs to complete the OEM+ look with a healthy dose of audible attitude.

Features/Benefits (G8x Axle Back Exhausts):

• Maximum gains of +6 HP and +5 lb-ft of torque
• Enjoyably louder, sportier sound
• Drone abatement technologies used to reduce cabin resonance
• Four, diffuser filling, 4.5-inch (114mm) double-walled, polished stainless steel (or coated black ceramic) clamp-on tips with laser engraved Dinan logo
• Larger diameter piping for increased flow (76mm vs. 70mm)
• 6-pounds lighter than the stock axle back (Stock: 44-pounds vs. Dinan: 38-pounds)
• Stock exhaust valve actuators reused, and operation of exhaust valve is unchanged so exhaust tone can be adjusted via the M-drive settings
• Computer controlled exhaust valves are retained and limit noise during low-speed driving and open fully during high-load conditions
• 100% 304 Stainless Steel construction
• Factory-like fitment with included mounting hardware

Description (G8x Middle Exhaust / X-Pipe): Looking to elevate the external acoustics of your G8x but want to upgrade in stages and/or not break the bank?

The Dinan Middle Exhaust for the G80 M3 is and G82/G83 M4 introduces a more aggressive tone and an increase in volume over the stock system while retaining the factory muffler at a budget friendly price point. Should the desire for more arise however, it can easily be paired with the matching Dinan axle back exhaust for further aural enhancement and a more aggressive growl. It is a union that boasts a bold, yet sophisticated, exhaust note that neither can fully achieve on their own.

This middle exhaust itself removes the hydro-formed factory center section from the secondary catalysts back to the axle back, including both resonators, and replaces it with larger 3-inch T304 stainless steel tubing for freer flowing capabilities. In place of the forward factory resonator, Dinan incorporates a beautifully crafted X-pipe made from mandrel-bent tubing for minimum restriction, unlike stamped X-pipes which are commonplace in the market. This hand-made 'X' is not only the focal point of the system in terms of aesthetics but also the star when it comes to the effects on the sound. Promoting even flow to both banks of tips, the 'X' removes unwanted nuances in sound caused by uneven exhaust flow that is present in the stock system. Along with the inherent benefit of increased volume by removal of the resonators, the Dinan X-Pipe for the G8x M3/M4 produces a louder, smoother, and fuller exhaust note that will deliver smiles time and time again.

Features/Benefits (G8x Middle Exhaust / X-Pipe):

• Smoother, louder and sportier sound
• 76mm (3-inch) tubing replaces stock 70mm (2.75-inch) tubing for free flow
• Deletes resonators between the secondary catalysts and rear muffler for increased volume
• Includes X-pipe crossover made from mandrel bent tubing for minimum restriction
• 5-pounds lighter than the stock mid-section (Stock: 22-pounds vs. Dinan: 17-pounds)
• 100% 304 stainless steel construction
• Factory-like fitment with included mounting hardware

[mattssi]

Haven't heard in person obviously...

But I think it sounds great! Def oem+.
Looks good
Priced good


Legit!!!

[Jset7]

Very nice sounding. Can the factory exhaust tips be used in place of the Dinan provided ones?

[hamzag20]

Definitely looks good, curious about whether the axleback will fit onto my Valvetronic Single Mid.

[Dinan_Engineering]

Originally Posted by Jset7

Very nice sounding. Can the factory exhaust tips be used in place of the Dinan provided ones?

Would not, besides the different mounting methods (slip-on vs. clamp-on) the stock tips go onto a stock 3.18" pipe whereas the Dinan tips go onto a 3" pipe so a stock tip would be pretty loose on the Dinan exhaust even if you did figure a way to secure it.

Originally Posted by hamzag20

Definitely looks good, curious about whether the axleback will fit onto my Valvetronic Single Mid.

Couldn't say definitively as its never been tested but assuming the valvetronic single mid uses the same factory cut points than there is little reason why it shouldn't mate.

[mike@x-ph.com]

[Bimmer100_]

Any videos with just the midpipe?

[akbjr]

is cutting of the stock exhaust required for either the midpipe or the axle back if used individually or together?

[Valvetronic Designs]

Originally Posted by Dinan_Engineering

Would not, besides the different mounting methods (slip-on vs. clamp-on) the stock tips go onto a stock 3.18" pipe whereas the Dinan tips go onto a 3" pipe so a stock tip would be pretty loose on the Dinan exhaust even if you did figure a way to secure it.



Couldn't say definitively as its never been tested but assuming the valvetronic single mid uses the same factory cut points than there is little reason why it shouldn't mate.

Nice work guys! we do use the factory cut points so you will be in good shape. Excited to see videos of this setup

[Dinan_Engineering]

Originally Posted by Bimmer100_

Any videos with just the midpipe?

Unfortunately not at present. Our stock system had an "accident" and requires some work. Rather than wait for it to be repaired/replaced we just did the complete system video so it could get released. Didn't want to postpone release any longer. Request is in however so individual clips will be forthcoming of both the individual components in the coming weeks.

Originally Posted by akbjr

is cutting of the stock exhaust required for either the midpipe or the axle back if used individually or together?

Cutting would be required regardless of if done individually or together. The stock exhaust is a single piece all the way up to the primary cats. We retain the secondary cats for emissions compliance/legality so would require cutting just aft of them. Instructions on the product page go into pretty specific detail on cutting and general installation should you want to get a better idea of what it entails.

Originally Posted by Valvetronic Designs

Nice work guys! we do use the factory cut points so you will be in good shape. Excited to see videos of this setup

Awesome. Good to get confirmation!

[Vinnrox250]

Very curious to see more videos as this comes out. I was sure I was going with something else, then this dropped.

[evoi19]

I like! Question, I’m looking at the axle back only since I have a full system already but would like to change only part of the system. If I’m local to the bay, do you offer install?
Thanks!

[Dinan_Engineering]

Originally Posted by evoi19

I like! Question, I’m looking at the axle back only since I have a full system already but would like to change only part of the system. If I’m local to the bay, do you offer install?
Thanks!

We moved out of the bay area in early 2018. Currently in Auburn, AL. That said, we don't offer customer hardware installs anyway -- strictly an R&D center. In the bay are though there are a number of good Dinan dealers though -- Performance Technic and Bavarium Autoworks are the 2 that come to the top of my head but there are quite a few others I am sure I am spacing on.

[evoi19]

Originally Posted by Dinan_Engineering

We moved out of the bay area in early 2018. Currently in Auburn, AL. That said, we don't offer customer hardware installs anyway — strictly an R&D center. In the bay are though there are a number of good Dinan dealers though — Performance Technic and Bavarium Autoworks are the 2 that come to the top of my head but there are quite a few others I am sure I am spacing on.

Haha ok that just shows how old I am! Thanks for the recs, I either go to PT or SE in San Jose. Looking fwd to order this quite soon!

[evoi19]

Ordered the axle back! Will post pics when it arrives.

[dj_intrinsic]

Originally Posted by evoi19

Haha ok that just shows how old I am! Thanks for the recs, I either go to PT or SE in San Jose. Looking fwd to order this quite soon!

Check out CarBahn in San Jose, Steve Dinan's new shop that specializes in more euros than just BMW.

[jpsimon]

Awesome! Any news on release date for the Carbon strut brace / engine cover?

[tom @ eas]

Just got these up on the site, looking forward to installing soon.

[Dinan_Engineering]

Originally Posted by evoi19

Haha ok that just shows how old I am! Thanks for the recs, I either go to PT or SE in San Jose. Looking fwd to order this quite soon!

Originally Posted by dj_intrinsic

Check out CarBahn in San Jose, Steve Dinan's new shop that specializes in more euros than just BMW.

See. Told you I was forgetting some. Carbahn too. Bavarian Autoworks (now owned by some old Dinan employees as well) was the old MV Dinan location if that has any bearing like Carbahn. Roots everywhere so to speak.

[skim]

Sorry not to hijack the thread, since this requires cutting of OEM system and I'm in CA, is there exhaust system difference between G80 and G82 and whether comp vs base? I'm wondering if I should keep an unbutchered one just in case..

[BMWnation]

I assume the video has the stock down pipes?

[FISH22]

Really excited to see this! Looks perfect and sounds great. I’m sure it’ll sound even better for us that have already ditched the secondaries utilizing other mid pipes.