[Chuckd30]

Nice. I like how you effectively have two different beasts. Sport sounds aggressive and comfort is very tame if you are ever in the mood for some quiet.

[Silvergt]

What is the best price you guys are seeing for the dinan? Tired of waiting and watching member classifieds for a used performance exhaust upgrade!

[Dinan_Rated]

Originally Posted by Silvergt

What is the best price you guys are seeing for the dinan? Tired of waiting and watching member classifieds for a used performance exhaust upgrade!

https://www.dinancars.com/products/e...4aAmMQEALw_wcB


big price drop!!

[deviation01]

Originally Posted by Scottatah

Received and installed. No obvious trouble with install or obvious rattles (said mechanic). My mechanic took a video for me. I haven't got to drive much, but in the very limited driving I've done, it's significantly louder than stock with the AA downpipe. Burbles are pretty intense. I initially wanted the MAD exhaust cause it was a little more aggressive sounding based on clips I found online. Currently probably satisfied I stayed with this as it's wild enough. Below aren't great comparisons, but it's what I have for those of you debating like I was.

Dinan Exhaust, AA Downpipe and a custom tune:
https://youtube.com/shorts/gvgsPgSWVFs?feature=share

Stock w/AA Downpipe and probably 93 Stage 1 OTS tune:
https://youtube.com/shorts/Rt5yP7ZGpKE

Stock with probably a 93 stage 1 OTS and lame revs in my parkade trying not to annoy everyone:
https://youtube.com/shorts/POljWFCTAzU

Haven't really had a chance to stare at the back and debate if i like the quad vs square exhausts.

I still don't understand the Dinan Exhaust and its idea to essentially run single pipe. You can see from the video the exhaust is picking the path of least resistance. Essentially only coming out from the far left pipe where the valve is supposed to be.

[Ekliptix]

What's not to understand. it's basically a straight pipe from the DP back, when in 'loud mode'. Maybe the most power?

[deviation01]

Originally Posted by Ekliptix

What's not to understand. it's basically a straight pipe from the DP back, when in 'loud mode'. Maybe the most power?

From factory our car is set to run dual exhaust system for maximum engine performance. If you take a look at the OEM design it is a single pipe unless you go into Sport then the valve opens. Thus reducing back pressure leading to better performance.

Dinan even at open seems to be running single pipe by the way it was looking from the air flowing in the video. This will create more back pressure hampering performance.

[D335NUTZ]

The only reason I can think of is weight savings. Every other after market exhaust kept the single to dual pipe design on the x3 exhaust.

[deviation01]

Originally Posted by D335NUTZ

The only reason I can think of is weight savings. Every other after market exhaust kept the single to dual pipe design on the x3 exhaust.

So at that point its basically weight vs backpressure impact on performance? What has greater benefit?

[JonasM40i]

Originally Posted by D335NUTZ

The only reason I can think of is weight savings. Every other after market exhaust kept the single to dual pipe design on the x3 exhaust.

I would also think of costs. Less material = less costs.

[D335NUTZ]

Either way. The exhaust coming out of 1 of the 4 tips annoys me 😂

[APOLAKI]

In person, the single pipe design sounds more violent WOT in sport vs. the mad catback. I thought it was a weird design too but the weight reduction and sound makes up for it. Just my 2 cents

[Ekliptix]

Def reminds me of 2JZ supra exhausts haha. The giant single canon from the turbo to the back.

[Dinan_Engineering]

Ultimately it comes down to is what the primary intended purpose of your exhaust is; boost performance or to elicit increased sound? Given exhaust benefits to power are largely negligible regardless of design, especially when emissions controls are in place, sound is likely the answer for most. Hence offering what is effectively a straight pipe when the valves are open to generate maximum sound.

On the tip front, all tips are functional albeit in different scenarios certain ones are favored more than others. That said, ff 4 equally flowing banks are a make or break thing then so be it. Tis the beauty of having options in the marketplace. We simply decided to focus on the sound above all else.

[grumpychocobo]

I don't know why people think the valve placement cuts off the exhaust route through the muffler. It functions exactly like our OEM functions.

When closed exhaust is blocked from completing the route through the "loud" route. All exhaust must route through the part of the back box (muffler) that reduces sound the most.

When open the route through the muffler is still there but there is a direct route as well that uses minimal sound deadening material in the case of OEM or straight pipe in the case of Dinan.

Exhaust back pressure will NOT increase nor stay the same when the valve is opened. It can only reduce because the preexisting route is still open as well as the easier/louder route.

Same setup/mechanics as OEM.

Lastly, I doubt very many M40is on here have actually modded up to the level that changes in the muffler design would net even noticeable improvements outside MAYBE a few HP on a dyno. Y'all worrying too much about stuff that doesn't matter at the power levels most everyone here is at.

[SteveYem]

I can’t really say by looking at the image on the first page, but I would guess that by default when the valve is closed. The exhaust gas is routed through the muffler and distributed to the other three outlets….unless the two inner outlet pipes on each side are just for show, which I doubt.
If I’m right, then exhaust gas would flow out of both sides of the rear of the car at startup when the valve is closed, which is an improvement for anyone irked by the stock exhaust configuration in this respect.

[Djaak1974]

So I had the Dinan exhaust installed. I don’t believe there’s a performance gain (or loss) unless you’re doing a dyno run, and I certainly don’t feel a difference in performance.
That said, it’s a completely different car—it’s how they were meant to sound from the factory.
It sounds unreal. I also did some long-distance driving: no drone, not annoying at all. Driving in Eco mode at a constant speed, you can hardly hear it.
Highly recommended—great build quality from Dinan. If you don’t have one, you’re definitely missing out on the best of the B58!
Do I like it? No—I love it!

[D335NUTZ]

Originally Posted by Djaak1974

So I had the Dinan exhaust installed. I don’t believe there’s a performance gain (or loss) unless you’re doing a dyno run, and I certainly don’t feel a difference in performance.
That said, it’s a completely different car—it’s how they were meant to sound from the factory.
It sounds unreal. I also did some long-distance driving: no drone, not annoying at all. Driving in Eco mode at a constant speed, you can hardly hear it.
Highly recommended—great build quality from Dinan. If you don’t have one, you’re definitely missing out on the best of the B58!
Do I like it? No—I love it!

Nice. Did you use bimmercode to add the sporty sound control?

[Ekliptix]

Originally Posted by Djaak1974

So I had the Dinan exhaust installed. I don’t believe there’s a performance gain (or loss) unless you’re doing a dyno run, and I certainly don’t feel a difference in performance.
That said, it’s a completely different car—it’s how they were meant to sound from the factory.
It sounds unreal. I also did some long-distance driving: no drone, not annoying at all. Driving in Eco mode at a constant speed, you can hardly hear it.
Highly recommended—great build quality from Dinan. If you don’t have one, you’re definitely missing out on the best of the B58!
Do I like it? No—I love it!

What's your downpipe setup? Thanks for the update.

[jsand5048]

anyone have an opinion on this exhaust on a 2020 m40i? I love the way my exhaust sounds, but hate the way it looks.

[D335NUTZ]

Originally Posted by jsand5048

anyone have an opinion on this exhaust on a 2020 m40i? I love the way my exhaust sounds, but hate the way it looks.

I'm assuming you hate the look of the tips since that's the only thing you can see. You can change tips pretty easily with clamp on or a shop welding new tips.

[jsand5048]

Originally Posted by D335NUTZ

I'm assuming you hate the look of the tips since that's the only thing you can see. You can change tips pretty easily with clap on or a shop welding new tips.

what clap ons? I haven't seen any available... As for welding new tips, which ones? Guess I can try to find a shop that would do that

[D335NUTZ]

Sorry typo. Should say clamp 😂