a quieter exhaust

Message

lazarus · #1 Post by **lazarus** » Fri Oct 25, 2013 12:11 pm

dont know why BMW have done it but the exhaust on the twin cam GS is loud. Aftermarket can loud. And a bit harsh too.

I appreciate that this is the reverse of what most people want but how can I modify the silencer to make it quieter. Incidentally, its the factory standard and done just 1400 miles so its lighly unlikely the existing packing is bu**ered.

I dont want to spend lots of money on an aftermarket can if I can make the standard one quieter.

D-Rider · #2 Post by **D-Rider** » Fri Oct 25, 2013 12:18 pm

Buy a Falco with a standard exhaust - whisper quiet and probably cheaper than a new system for a beemer.

Sorry I don't have an answer for what to do to the BM system itself

randomsquid · #3 Post by **randomsquid** » Fri Oct 25, 2013 4:17 pm

Generic DB killers are about 20 quid on fleabay if your can has an appropriate hole, I know some modern stuff is weirdly shaped.

I tried just hopefully bodging some extra packing down a can once. Went choke, cough, cough, splut, bang - and shot it all back out again.

lazarus · #4 Post by **lazarus** » Fri Oct 25, 2013 4:43 pm

its a double hole in an oval end cap. cant find a suitable db killer

randomsquid · #5 Post by **randomsquid** » Fri Oct 25, 2013 5:01 pm

Just a thought, has it got an exhaust valve in the can somewhere? Might be stuck or have been disabled by a previous owner. Saw one on a recent z1000. Pivotty thing on the back of the can worked by a couple of cables attached to a motorry thing on the bike.

fatboy · #6 Post by **fatboy** » Fri Oct 25, 2013 5:31 pm

If it isn't the pivotty thing stuck....
how about having some baffles fabricated, not that much to them, you just need the correct size

lazarus · #7 Post by **lazarus** » Tue Oct 29, 2013 1:35 pm

randomsquid wrote:Just a thought, has it got an exhaust valve in the can somewhere? Might be stuck or have been disabled by a previous owner. Saw one on a recent z1000. Pivotty thing on the back of the can worked by a couple of cables attached to a motorry thing on the bike.

yes its got a pivoteyu thing in the pipe ahead of the silencer. but I dont thing its stuck. in any case, apparently its designed to close at the revs at which exhaust noise is measured for the eu limits. so its normally open anyway.