[sku01]

BIMMERPOST / Classifieds

Asking Price:

Sold

Item Interest

For sale is a set of M5 mufflers fitted for an F07/F10 535i. Included is a set of 1/4 wave side branch resonators, which did a very good job of quieting down the interior noise. Exhaust sounds beautiful, and though most enthusiasts love the note, my wife and kids do not. It is a family car, so they must go. Quad 4” rolled burnt tips. Fits perfect in any quad diffuser, but sales are final so do your research and ask questions prior to purchasing. Local pickup (Orange County/LA) only as the mufflers are large with the piping. Please see photos below:

Price: $650 local pick-up PRICE ADJUSTMENT

[Merciless58]

total noob question here, but what are the pipes at the top of the tips connected to? Or, what is the purpose of having those extra pipes?

Thanks,

[STiLLsLow]

Sounds great and interesting use of resonators, haven't seen that before. GLWS!

[ndinh]

Originally Posted by Merciless58

total noob question here, but what are the pipes at the top of the tips connected to? Or, what is the purpose of having those extra pipes?

Thanks,

I'll take a stab at the question. The extra curved pipes are similar to what people call 'J' pipes. These are welded on before the muffler to cancel out the drone frequency, thus eliminating or at least minimizing drone. I'm not completely sure how exact the 'J' pipes have to be but there's a specific optimal size for each individual exhaust setup from what I've read.

[sku01]

Thanks Merciless58 ! They are quarter wave branch resonators. They are tuned to target unwanted noise at the low RPM range, aka drone. Sound travels up through the tubes and gets reflected back to cancel out sound. Since they are closed off, there is no impact on performance. Similar to how a Helmholtz resonator might work.

[sku01]

That is correct ndinh ! Thanks for the assist!

[The_M6]

are these the Megan Racing mufflers on Ebay? I've been eyeballing them for my 550 but wasn't sure if I'd like them since there's not too much data on them.

[sku01]

Originally Posted by Cooljust

are these the Megan Racing mufflers on Ebay? I've been eyeballing them for my 550 but wasn't sure if I'd like them since there's not too much data on them.

Yeah there are some on eBay! Being an M5 muffler, they are not perfect fit on the non M. 4" tips tho are very nice. This setup should fit the 550 very nice as well. Sound is amazing.

[The_M6]

Originally Posted by sku01

Yeah there are some on eBay! Being an M5 muffler, they are not perfect fit on the non M. 4" tips tho are very nice. This setup should fit the 550 very nice as well. Sound is amazing.

Too bad your on the left coast...I'd definitely pick them up.

[Merciless58]

Originally Posted by ndinh

I'll take a stab at the question. The extra curved pipes are similar to what people call 'J' pipes. These are welded on before the muffler to cancel out the drone frequency, thus eliminating or at least minimizing drone. I'm not completely sure how exact the 'J' pipes have to be but there's a specific optimal size for each individual exhaust setup from what I've read.

Thank you.

[Merciless58]

So, the mufflers were cut down to where the axles are and then welded the new ones?

Was this a "heavy" (time) mod?

[Merciless58]

Sorry for all the questions. Obviously this is interesting as I am trying to have my exhaust system modified as well.

[sku01]

Originally Posted by Merciless58

So, the mufflers were cut down to where the axles are and then welded the new ones?

Was this a "heavy" (time) mod?

To be honest it was. Only due to trial and error. That is not being factored into my price however. The M5 system is a 3.25" inlet that only protrudes maybe 4" outside the muffler. Originally, the piping needed to go from 2.5 to 3.25, and the hangers modified. After initial install, I was not happy with the low end drone. So I went back to have the quarter waves made. This helped tremendously. Low end drone was almost eliminated. These are about 40" in length to target the low cruising RPM's. At 65-70, there is almost no noise unless you get on the gas... when you would want the sound anyways.

[sku01]

Merciless58 Also note that you want the pipes to come off at a 90* angle from the source pipe.

[sku01]

Price adjustment. Someone grab this for a great deal!

[Merciless58]

That's a great deal. Free bump. If you decide selling outside of CA, give me a shout.

[sku01]

Originally Posted by Merciless58

That's a great deal. Free bump. If you decide selling outside of CA, give me a shout.

Might be if we can work a deal on shipping... Not sure how to ship something so large. I'll look into it.

[AMT92]

What exhaust shop did the J pipe for you? What did it cost you?

[sku01]

Originally Posted by AMTF10

What exhaust shop did the J pipe for you? What did it cost you?

Cypress Muffler. Steve is awesome for many things that other shops won't touch. Tell him Scott referred you.

[whiteaccordvtec]

does this come with the diffuser? also what exhaust did u end up switching with ?

[sku01]

Originally Posted by whiteaccordvtec

does this come with the diffuser? also what exhaust did u end up switching with ?

No sorry. Diffuser is not included. Right now on pea-shooters!

[ededic00]

Do you have any more pictures of the exhaust installed. Trying to figure out if the quad 4" tips are too big for the F10.