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      05-24-2015, 02:48 AM   #12
texasjohn
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Quote:
Originally Posted by clerkpalmer View Post
Bolts up to the stock downpipes. I am using the M5 xpipe but you don't have to. Muffler shop said it was a bit of a pia but not that big of a deal. They had to move the hangers and adjust the tips. Not sure what else ... I didn't really ask for details.
I just had this same installation on a 550i (RWD) in the UK. The car is completely whisper silent on the stock exhaust, unlike the E60 which had a nice backtrack of V8 noise (although the E60 was still pretty quiet, you had to listen hard for it).

550i is 2010, and the M5 exhaust system came off of a 2015 car.

All in all it was about 8 hours labour. It is not really a direct bolt on, but probably overall cheaper than an aftermarket full exhaust.

The PNs you need are:

18207845461/3 x 1 of each
18207585358 x 4
18207578229/30 x 1 of each
18207832991 x 2
51618048827 x 1

Where the front of the exhaust system meets the downpipes it is not a true bolt-on. The flanges are a little different:

https://drive.google.com/file/d/0B3y...ew?usp=sharing

The workshop I used ran the 550i system back from the downpipes about 24" to the 'bulge' in the pipes (not sure if these contain secondary cats or an absorption muffler) and thereafter it is the M5 system.

Some hangers needed to be relocated and the cross member bracket needs to be replaced to accommodate the x pipe (which replaces the centre resonator you have on the 550i).

I had the 550i tips refitted as I wanted to retain the 550i SE looks. Thus I had custom fabrication of the tailpipes between the backbox (muffler in US) and tips, using some 57mm bosal exhaust tube. First of all I went without the exhaust flaps but it was too loud and droned, particularly under load like uphill on the motorway at 70mph.

See link for the audio of the system without flaps:

Start:
https://drive.google.com/open?id=0B3...REk&authuser=0


I have now had the M5 flaps fitted in the outboard tailpipes and it is loud on a cold start and also when it really 'gets on it' over 2500rpm, you can literally tell when the flaps are opening. The power comes on a little harder as the flaps open (as you might expect).

It isn't whisper quiet below 2500rpm and is probably just about as loud as most 40 year olds would want, certainly near the limit for me. But it has a nice burble and doesn't scare small animals and children. It is louder than a stock E60 550i.

See links for video of low revs with flaps closed:

https://drive.google.com/open?id=0B3...aUk&authuser=0

https://drive.google.com/open?id=0B3...bFE&authuser=0


I am not sure why (probably due to something upstream of the exhaust system, ie manifolds) but the 550i is louder and more 'bassy' with the M5 exhaust than the M5 is. AFAIK, the cc and firing order is the same.

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Last edited by texasjohn; 05-24-2015 at 03:00 AM..
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