Shortening Stock Mufflers

[HOMUTH]

Hi All

I believe all the early monsters used the same or similar looking oval cross section mufflers from roughly 1998>2005ish

Saw a photo of a bike that appeared to have stock mufflers with maybe 3" cut off the back & the stock exhaust tips put back on

What is inside these mufflers? if anyone has done this any info or tips would be appreciated

Thanks!!

[booger]

Check out the Tutorials, I put a S*R full core tutorial on there. The non S*R mufflers can't be much different. What's inside is a steel tubey mass. You want to stick a Dremel cutoff wheel into the end and cut a couple welded straps which release the endcap. You will observe that there is an outside aluminum sleeve covering an inner steel housing. Any threaded bosses must be preserved or otherwise provided for, but other than that if you chop all that out and replace with a straight perf tube and glasswrap packing you will essentially have a Termignoni muffler.

[GregP]

I did a set of stockers from a 2003 Monster. It’s pretty straight forward and there are a bunch of threads detailing the process. I will advise that in my experience, it was stupid loud after I did the chop and opened the end cap. IMHO, not a nice exhaust note you get from a set of Termis or other aftermarket can, but a WWII fighter plan loud. It was fun for a bit but I ended up going with a set of Remus cans when it got old.

[booger]

I did a set of stockers from a 2003 Monster. It’s pretty straight forward and there are a bunch of threads detailing the process. I will advise that in my experience, it was stupid loud after I did the chop and opened the end cap. IMHO, not a nice exhaust note you get from a set of Termis or other aftermarket can, but a WWII fighter plan loud. It was fun for a bit but I ended up going with a set of Remus cans when it got old.

Did you run a straight perforated tube wrapped with fiberglass packing? If you just cut it open you are merely going halfway. You actually have to use packing. The mufflers I did sounded really good.

[Charlie98]

but a WWII fighter plan loud. .

 

You actually have to use packing.

True that, unless you run WFO throttle all the time (...unlikely.)

I had a 4-1 V&H pipe on my CBR1000F, after about 5 years not only was it obnoxiously loud with a terrible exhaust note, performance wasn't as good as I remembered.  I pulled the baffle only to find about 75% of the 'glass was gone.  I repacked it and was astounded at the difference, not only in sound, but performance.

[buzzer]

I did some recently...  its not difficult and they polish up nice.  makes a difference to the look of the bike, and I like the sound!

you can flat the original finish off with 400 grit in an orbital sander, they polish easy after this...