rodybmw

I am sure that the B&B from a 545 can be "made to fit" a 550, but I don't know if it will be plug and play. When I switched to my B&B I did notice a bit of a loss in acceleration, but when I switched back to my stock muffler I realized how significant it really was. I noticed an immediate improvement in acceleration when I re-installed my stock muffler.......the car had a lot better throttle response too.

Before you install a B&B you should know that they do have a problem with annoying resonant frequency vibrations and noise between approximately 1000 and 2000 RPM. I did not realize how much of driving is spent in that RPM range until I put the B&B on my car. It became too annoying so I had to take it off. It sounded great from outside the car, but too much noise and vibrations within that RPM range inside the car.

I guess B&B now realizes that resonance is not a good thing because now they are making mufflers with what they call "Purge Resonance Technology" (PRT) which according to them "eliminates in-cabin noise". Last time I checked their website it seemed like they were only making the RPT mufflers for Porsches. >>>>>CLICK HERE<<<<<

rodybmw

Assuming that this will physically work it would still not be an option for me because the mufflers on the 6 series make it sound too much like an American muscle car V8, and I just hate that sound.



I was also thinking that fitting the new sport package 550 muffler on out 545's would be a good idea, because according to BMW it will have a sportier sound yet it will still be OEM so there would be no risk of resonance or other issues. The only thing I worry about is that when they say "sportier sound" I hope that they don't mean like the sound on the 6 series. As I said above I think that sounds too much like the rumble of the American muscle car V8's. :thumbsdown:

Also, when I read "...sportier sounding differentiated exhaust pipes..." on BMWusa.com I assumed that it was still a dual (one sided) exhaust but that the sound "differntiated it" from regular non-sport package 550's. I am not so sure that by "differentiated" they mean quads. I guess we'll find out soon.

andy545

Same here. Looking foward to see what exactly this entails.

rodybmw

Here are some sound clips that I personally taped of a 545i with Eisenmann Racing Type muffler and two 545's with B&B's:


EISENMANN (RACING TYPE):

>>>>>Eisenmann Racing on 545i................Idling and Revving<<<<<

>>>>>Eisenmann Racing on 545i.......Inside Car with driver's window open<<<<<

>>>>>Eisenmann Racing on 545i.....Inside Car with all windows closed<<<<<

>>>>>Eisenmann Racing on 545i.....Outside Car / Accelerating<<<<<

>>>>>Eisenmann Racing on 545i......Outside Car / Passing<<<<<




B&B on a 545i:

>>>>>B&B Triflo on 545i...........Idling and revving<<<<<

>>>>>B&B Triflo on 545i........Inside Car / Windows Closed<<<<<

>>>>>B&B Triflo on 545i...........Outside Car / Accelerating<<<<<

>>>>>B&B Triflo on 545i.........Outside Car / Passing<<<<<




B&B on my car:
Camera attached to the car