1M exhaust shots from Detroit

[My E90]

I haven't seen much info on the exhaust for this thing so I snapped a few upskirt shots while in Detroit.

[eeghie]

nice shots thx, do you happen to have one that shows the label on the shocks?

[My E90]

Saw your post earlier but nothing I took focuses on that area. You might get lucky if someone can get close enough at Daytona.

[MDORPHN]

Assuming the photos are in front to back sequence, am I correct that we're looking at a cat, a resonator and muffler?

If so, any guesses what it would sound like with the resonator removed?

Neil

[formula M]

I hope BMW releases a highly-engineered Ti exhaust for this.

[quarkmaschine]

The "one in four out" setup with the rear silencer still annoys me.

Best, Robert.

[zEdP]

Originally Posted by quarkmaschine

The "one in four out" setup with the rear silencer still annoys me.

What's wrong with this setup?

[skyphab]

What I'm still wondering is, if the final 1M exhaust will get noise flaps for low revs, like the other models?

[quarkmaschine]

Originally Posted by zEdP

What's wrong with this setup?

I'd exspect a true dual exhaust, like on any other M car so far (or even the 335i). What we get here is kind of boy racer setup... Just my 2.

Robert.

[Advevo]

the back exhaust of the E46 M3 is 2 in 4 out.

It doesn t matter to me much.

All you want is a free flow titanium exhaust for a turbo anyway.

[WAY]

Originally Posted by Advevo

the back exhaust of the E46 M3 is 2 in 4 out.

It doesn t matter to me much.

All you want is a free flow titanium exhaust for a turbo anyway.

Hey Andre, you are getting 1M too? Man we have similar taste in cars!

Let me know when you convince Akrapovic to make us a freeflow titanium exhaust!

[zEdP]

Originally Posted by quarkmaschine

I'd exspect a true dual exhaust, like on any other M car so far (or even the 335i). What we get here is kind of boy racer setup... Just my 2.

Instead of two pipes it uses one seriously thick diameter. It’s the last catalytic converter that merges the two pipes from the engine into one. I don't see any impact on the performance. If you think it will have a negative impact on the flow resistance, be afraid of the catalytic converters within the exhaust system.

I’m no exhaust sound engineer, so I have idea if it will sound that different the one vs two pipe setup.

I guess there is not enough space to route a double pipe between suspension parts and M-differential.

[treehacker]

Originally Posted by zEdP

Instead of two pipes it uses one seriously thick diameter. It’s the last catalytic converter that merges the two pipes from the engine into one. I don't see any impact on the performance. If you think it will have a negative impact on the flow resistance, be afraid of the catalytic converters within the exhaust system.

I’m no exhaust sound engineer, so I have idea if it will sound that different the one vs two pipe setup.

I guess there is not enough space to route a double pipe between suspension parts and M-differential.

And I think the setup with one bigger pipe weights less..... And regarding the performance I don't think there is a difference because if you take two pipes os lets say 5cm diameter, at the end, its the same as one pipe with 10cm diameter.

[rca06Mcoupe]

Thanks for these pictures. All I remember seeing is one pic from the Detroit show of the 1 pipe > quad pipes at the tail of the car. From that pic there was no way to see the "exhaust header" pipes / dual pipe set up which extends a good way under the car.

And I can clearly see the transition to the extra large diameter solo pipe(s).

I like the set - up.

I'd still like to see sometime how the Z4 335is exhaust system is configured for comparison purposes, since there appear to be dual exhaust at far ends of the backside of the Z4 335is.

[MDORPHN]

Originally Posted by zEdP

Instead of two pipes it uses one seriously thick diameter. It’s the last catalytic converter that merges the two pipes from the engine into one. I don't see any impact on the performance. If you think it will have a negative impact on the flow resistance, be afraid of the catalytic converters within the exhaust system.

I’m no exhaust sound engineer, so I have idea if it will sound that different the one vs two pipe setup.

I guess there is not enough space to route a double pipe between suspension parts and M-differential.

I'd appreciate it if you could describe the location of the catalytic converters, the resonator (if there is one), and where the two pipes merge into the large diameter single pipe that goes into the one in, four out muffler.

Thanks!

Neil

[1Mer]

Originally Posted by treehacker

if you take two pipes os lets say 5cm diameter, at the end, its the same as one pipe with 10cm diameter.

Actually, a single pipe only has to be 20% bigger to have a lower flow resistance than two separate pipes!

As zEdP said, if you're worried about flow resistance, it's the cat's that are the real problem

[zephyr]

Can someone give a logical explanation, why the muffler looks, as it has been welded two hours before the showcase! I think, this was already mentioned in some thread but nevertheless i find very strange that the it looks like it comes from a middle development stage prototype! A really hope the final production units will have a normal one, cause this will be ridiculous. Or could it be, that they had put a specially developed one in order to get a better sound for the showcasings? Anyway, some answers or thoughts would be appreciated!

[zEdP]

Originally Posted by rca06Mcoupe

I'd still like to see sometime how the Z4 335is exhaust system is configured for comparison purposes, since there appear to be dual exhaust at far ends of the backside of the Z4 335is.

[MDORPHN]

Originally Posted by zEdP

And how do you figure the 1M exhaust is configured?

Thanks.

Neil

[rca06Mcoupe]

Originally Posted by zEdP

''''''''''''''''''''''''''

Thanks!

[My E90]

Originally Posted by MDORPHN

I'd appreciate it if you could describe the location of the catalytic converters, the resonator (if there is one), and where the two pipes merge into the large diameter single pipe that goes into the one in, four out muffler.

Thanks!

Neil

There are two Cats at the end of the downpipes (first picture), two additional secondary cats in the middle section (offset cylindrical canisters), a resonator where the two pipes merge into one and then a muffler at the rear. A midpipe from MadDad will eliminate the secondary Cats and rear resonator (it's fairly large) and replace them with two mini resonators. Should bolt right on and give a nice little bump in power and sound.

[MDORPHN]

Originally Posted by My E90

There are two Cats at the end of the downpipes (first picture), two additional secondary cats in the middle section (offset cylindrical canisters), a resonator where the two pipes merge into one and then a muffler at the rear. A midpipe from MadDad will eliminate the secondary Cats and rear resonator (it's fairly large) and replace them with two mini resonators. Should bolt right on and give a nice little bump in power and sound.

Thanks. That's exactly what I was looking for

Neil