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      02-22-2020, 08:13 AM   #595
Lifestyler
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Quote:
Originally Posted by doughboy View Post
Any photos of the build? I'd like to see it now if possible
Sorry don't share pictures from final build.
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      02-22-2020, 08:15 AM   #596
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Sorry don't share pictures from final build.
Ok cool.

I think i need to replace mid cats with 2 silencers to just tone down the rasp a bit more.

We'll see..
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      02-22-2020, 09:19 AM   #597
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Quote:
Originally Posted by doughboy View Post
Looks good.

Yes it'll merge in the silencer but only with valves shut, when they're open the silencer is effectively bypassed with that milltek design.
Wouldn't they still merge with valves open, even though most of the flow will go straight out the pipes? The muffler won't close with valves open.

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Originally Posted by Lifestyler View Post
OK 🤣 then follow the thread and see what I do..
I've followed the thread since day one. I didn't mean to offend you, but the video has kind of the same tone as my current AA + Remus combo. Might not sound the same in real life.
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      02-22-2020, 09:34 AM   #598
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Originally Posted by Flange View Post
I also wondered about the lack of merge point, unless they merge in the first part of the back box?
It looks a bit tight under there for the bend and an x pipe though.

The merge point would have to be after the bend/ extra pipe, but as you can see under the M2 there’s just no room to put the bend further up.

However they’ve done it, to me it certainly doesn’t sound like 2 x 3 cylinders....
Looking at the pics I was wondering that. Looks like the muffler mixes the pulses enough even with the valves ope, similar to a Y bend people have added to the stock system. From the video I couldn't detect any of the S55 3 cylinder buzz at all.
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      02-22-2020, 11:31 AM   #599
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The Milltek EQ still technically crosses over and should with the valves opened, it's just not maximized given the length of the pipe spanning that wide. Sound waves work in crazy ways, their video definitely shows that the waves are blending like they should and sounds pretty good!

Last edited by spool twice; 02-22-2020 at 12:27 PM..
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      02-22-2020, 11:47 AM   #600
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Quote:
Originally Posted by doughboy View Post
H pipe behind the diff.

They've done a nice job.

Sound is much smoother, sound lovely at idle and standing revs. But under load with valves open its has a loudish rasp comes in at 3.5 to 4.5krpm, which is just llike my old milltek did, but this sound better even so.

But at 5k it quietens up and seems to sing up to the red line.
Looks clean!
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      02-22-2020, 12:01 PM   #601
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Quote:
Originally Posted by spool twice View Post
Looks clean!
Thanks.

I think i need to swap the secondary CATs for mufflers to kill some rasp with the valves open.

At the moment I've pulled the flap motor fuses to keep them shut. Sounds just great like that. Just a quick fix for now.
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      02-22-2020, 01:00 PM   #602
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Quote:
Originally Posted by Lifestyler View Post
Yes I would say we got it. We are 95% happy with it.

https://youtu.be/zbfH6_vBG4Q

https://youtu.be/S5BIe2jhFqw

Mobilephone Videos, live sounds deeper, no rasp at all.
Sounds like a stock zcp. Nice prank.
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      02-22-2020, 01:03 PM   #603
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I'm going to need to start updating my first post to include list of companies who are now on board with equal-length exhausts

So far:
AA
Valvtronic
Milltek
TopGear

Looking at AWE's system (especially the track mufflerless system), it should be easy to do with theirs. Same with Magnaflows smaller/compact muffler. Hope more come forth.
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      02-22-2020, 01:39 PM   #604
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Quote:
Originally Posted by Lifestyler View Post
Yes I would say we got it. We are 95% happy with it.

https://youtu.be/zbfH6_vBG4Q

https://youtu.be/S5BIe2jhFqw

Mobilephone Videos, live sounds deeper, no rasp at all.
That sounds like stock unequal length to me...
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      02-22-2020, 02:31 PM   #605
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Quote:
Originally Posted by Alan l. View Post
That sounds like stock unequal length to me...
Have you seen his other video? I guess he fixed the rasp at 6 seconds, I wish he would share some details:

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      Yesterday, 04:12 PM   #606
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What I've noticed even more than usual exhaust stuff from doing my own equal length setup is that you can't listen to video on a crap phone speaker and think you have an idea of the sound.

Mine has so much more low frequency loveliness than you can hear on any device. You can 'feel' it, it sounds great - with the valves shut. Smooth and sound builds as the revs rise.

But the 4-5k rasp comes in badly with the valves open on mine, like a resonance in the system. So I just mapped it with BM3 to leave the flaps shut in efficient and sport. To me it's perfect and doesn't seem to affect performance at all, just keeps the rasp away.

I know some people couldn't live with that, but until I get time to fit more mufflers somewhere I'm very happy. £275 very well spent
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      Yesterday, 04:43 PM   #607
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Have to agree, the depth of tone with an EQ setup isnt realized with a microphone, on line when the valves open, there is an hint of exotic roar that occurs at part throttle, makes heads turn actually. Like a brassy roar that occurs.
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      Yesterday, 05:38 PM   #608
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I seem to have a bit of a farty rasp in 1st and 2nd gears but only in Sport+ combined with auto bear change.
The car changes up too quickly, but it’s ok when using the paddles and holding the gears just a touch longer.
In efficient mode, the tone is fantastic and even when the valves open at 4K it sounds brilliant.
I don’t have any rasp from 4K

I could now quite happily just use Efficient most of the time and not worry about traction in the crappy weather, but still have the car sounding good.

I reckon this new exhaust is going to stop me from changing this car anytime soon...

And I have to agree about listening to the sound on speakers - it just doesn’t compare to real life!
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      Yesterday, 05:52 PM   #609
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Quote:
Originally Posted by doughboy View Post
Thanks.

I think i need to swap the secondary CATs for mufflers to kill some rasp with the valves open.

At the moment I've pulled the flap motor fuses to keep them shut. Sounds just great like that. Just a quick fix for now.
Remind what you have on your whole system.
Sports cats and no OPF’s?
Centre res deleted too?
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      Yesterday, 06:17 PM   #610
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Summer 2020 is going to be the year of good exhaust systems for the F80 and I have fistfuls of money ready!!
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      Yesterday, 06:37 PM   #611
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I don't think BMW didn't know about this, and perhaps their intended best sound (they have a hundred years of expertise with lots of great sounding cars), with consideration of other factors, is captured in MPE or M4GTS or M4GT4 exhaust systems. So I think those sounds decent (especially on race track) and still would hold some value. Having that said, F8x sounding like some of P-cars (in some rev range) or some of legendary Japanese cars are pretty awesome and I am looking forward to seeing how this things gets matured, either a cat-back or modification solution of stock/MPE exhaust.

THANK YOU!

Last edited by MyFragileHalogen; Yesterday at 06:47 PM..
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