Straight-piping a 545i Touring
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Courtesy of Silver Systems (Powerflow agent) in Leek, Staffordshire:
Step 1 - cut off rear silencers:
![](http://i188.photobucket.com/albums/z8/boswellcourt/IMG-20111221-00035.jpg)
Step 2 - discard rear silencers (and save about 20kg!):
![](http://i188.photobucket.com/albums/z8/boswellcourt/IMG-20111221-00036.jpg)
Step 3 - leave everything forward of this well alone:
![](http://i188.photobucket.com/albums/z8/boswellcourt/IMG-20111221-00037.jpg)
Step 5 - weld on stainless steel 3" pipe in its place:
![](http://i188.photobucket.com/albums/z8/boswellcourt/IMG-20111221-00039.jpg)
Step 6 - use 3" oval dual tips for that stock Alpina look:
![](http://i188.photobucket.com/albums/z8/boswellcourt/IMG-20111221-00039.jpg)
Step 7 - sit back and enjoy the sound:
![](http://i188.photobucket.com/albums/z8/boswellcourt/IMG-20111221-00044.jpg)
Will try and get a video of the noise up but it sounds like a NASCAR! Bit of a boom at 1900rpm under load (and a lovely deep burble at idle) but the sound is so clean above 3000rpm is glorious.
Odd as it sounds (and I might be over-sensitive here) but it feels like its lost a bit of that second kick at about 5000rpm that it used to have, feels more linear through the rev range but a bit down on power?
Step 1 - cut off rear silencers:
![](http://i188.photobucket.com/albums/z8/boswellcourt/IMG-20111221-00035.jpg)
Step 2 - discard rear silencers (and save about 20kg!):
![](http://i188.photobucket.com/albums/z8/boswellcourt/IMG-20111221-00036.jpg)
Step 3 - leave everything forward of this well alone:
![](http://i188.photobucket.com/albums/z8/boswellcourt/IMG-20111221-00037.jpg)
Step 5 - weld on stainless steel 3" pipe in its place:
![](http://i188.photobucket.com/albums/z8/boswellcourt/IMG-20111221-00039.jpg)
Step 6 - use 3" oval dual tips for that stock Alpina look:
![](http://i188.photobucket.com/albums/z8/boswellcourt/IMG-20111221-00039.jpg)
Step 7 - sit back and enjoy the sound:
![](http://i188.photobucket.com/albums/z8/boswellcourt/IMG-20111221-00044.jpg)
Will try and get a video of the noise up but it sounds like a NASCAR! Bit of a boom at 1900rpm under load (and a lovely deep burble at idle) but the sound is so clean above 3000rpm is glorious.
Odd as it sounds (and I might be over-sensitive here) but it feels like its lost a bit of that second kick at about 5000rpm that it used to have, feels more linear through the rev range but a bit down on power?
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My Ride: 2010 535 xi - M Sport Pkg & other goodies
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Can't wait for the vid! Well done! These cars are too silent when you get on them.
I guess if you had done a before/after dyno, you could confirm your butt dyno is right or not...
I guess if you had done a before/after dyno, you could confirm your butt dyno is right or not...
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My Ride: 2010 535 xi - M Sport Pkg & other goodies
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Link for the lazy:
http://www.youtube.com/watch?v=gO-rFUbcdE4
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