best way to 'hide' muffler....

[Johndoe]

the muffler shows quite a bit - -looks pretty cheap in a high end car...would spray painting a higher gloss silver do the trick - currently you end up seeing dark yellow welding blotches and a very ugly/ visible muffler under the quad pipes ....!

[M3aHOLIC84]

if it was a dark car liek black or jerez you could paint it the color of the car or simply black and get it done...but first of all sedan owners have to figure out how to hide those ugly rear lights of theirs...ugliest lights ever

[jtown]

Do NOT paint it the color of the car. Ever see those $5 mako paint jobs where they forget to cover up the exhaust when they spray the car? Good lord ... please do not bastardize the M that way.

Best way to hide it is to go aftermarket. Maybe a stock sounding and looking exhaust will come out

[M3Kevin]

1) Do not paint it. Fire hazard.
2) Do not paint it. It will discolor.
3) Do not paint it. It will shorten the life of the muffler due to increased heat.
4) Do not cover it - heat needs to be dissapated. Covers will prevent that and heat up other areas not shielded for the new heat load.

[WCH]

Wouldn't painting it black make it less visible? One would need to use a heat resistant paint...

[Revin9k]

powdercoat the mufflers black. or you can invest in a remus exhaust which has black mufflers.

[CampioniShop]

Our exhaust is blacked out from the rear, you can't see it:

[swamp2]

Originally Posted by Remus

Our exhaust is blacked out from the rear, you can't see it:

Looks good. I especially like the flat black solution to further hide and address certain visibility concerns. I am noticing that most aftermarket solutions for the E9X M3 are dual canisters, whereas stock is a single canister. My concerns about all of these dual canister configuraitons is the drastic change in the shape of things right in and around the rear diffuser and differentialm area. The design of the cars underbody, area around the differential and diffuser all seem to be key ingredients in providing proper cooling air for the differential. So here is the key question. Has Remus done any analysis or testing on the air flow or cooling to insure this large design change does not affect either differential cooling or other aerodynamic issues?

[nusevad]

Either get new mufflers or a rear diffuser.

[m3forever]

Originally Posted by FifthStreetz

Either get new mufflers or a rear diffuser.

+1

[MrHarris]

That Remus looks nice, any sound clips?

[gorun]

Remus does not center very well in this pic. Can this be adjusted?

[gorun]

Originally Posted by M3aHOLIC84

if it was a dark car liek black or jerez you could paint it the color of the car or simply black and get it done...but first of all sedan owners have to figure out how to hide those ugly rear lights of theirs...ugliest lights ever

that is so true. hihi true jap style rear light cluster

[BCMPOWER]

^ I think that was a bad install, a company like remus is going to make sure its products fit correctly. They are manufacturers for some of the top tuners they have to get it right.

[BCMPOWER]

Originally Posted by MrHarris

That Remus looks nice, any sound clips?

check out this thread http://www.m3post.com/forums/showthread.php?t=122438

[CampioniShop]

Wow, I had never seen that install picture before, looks awful!
Our exhaust comes with adjustable hangers, that installation shop must have done something wrong.

Swamp2 :
I will contact REMUS Austria about this as it is a very technical question.

[jtown]

Originally Posted by Remus

Wow, I had never seen that install picture before, looks awful!
Our exhaust comes with adjustable hangers, that installation shop must have done something wrong.

Swamp2 :
I will contact REMUS Austria about this as it is a very technical question.

Maybe they're on backwards. Haha. Hopefully the bumper isn't melted on that one.

[swamp2]

Originally Posted by jtown

Maybe they're on backwards. Haha. Hopefully the bumper isn't melted on that one.

That will melt the diffuser FOR SURE. Tips get HOT especially when you are pushing it a bit. Terrible...

[lucid]

Originally Posted by swamp2

Has Remus done any analysis or testing on the air flow or cooling to insure this large design change does not affect either differential cooling or other aerodynamic issues?

I seriously doubt any of the aftermarket exhaust manufacturers are testing this thoroughly. They would have to instrument the car with flow and temp sensors and drive it at varying conditions for extended periods of time to collect data. Even if they were to do that, I doubt that they would know how to interpret the data. Say, they noticed a temp increase in the differential cooling fins. How would they go about interpreting if that is significant or not, and if it might result in some kind of damage to the differential in the long run (unless the delta is so high that the issue is blatantly obvious, which is unlikely just for an exhaust mod)? BMW engineers might be able to interpret the data for them, but why would they get involved? I think this is all trial and error engineering (well tinkering really), and that's the risk one takes when installing an aftermarket exhaust system.

On a similar note, I have much more of a concern about lowering the car. I wish BMW would somehow release info on what the flow and cooling implications of that might be. They have obviously studied that carefully before deciding on a ride height. The thing rides higher than a 335 coupe, so clearance and everyday drivability are not the reasons behind that decision.

[Johndoe]

...ie. only spray paint heat-resistant black paint behind the exhaust where muffle is currently visible......that should not lead to overheating ...or is it major NO NO.....

[CampioniShop]

Swamp2:
According to REMUS Austria, the exhaust design allows for more cooling of the differential as tested in their R&D department. The tests results cannot be shown to the public. Furthermore, the canisters are packed with heat resistant insulation wool to prevent overheating the differential.

They did not test aerodynamics because REMUS does not have a wind tunnel.

[M2MG17]

get a diffuser