MC21 stock exhaust

**Wed Aug 10, 2016 6:54 pm » Post: #1 » Download Post**

Does any know if the stock expansion chambers have internal stingers?

**Tue Aug 30, 2016 11:22 am » Post: #2 » Download Post**

Not to my knowledge. I can assure you they are pretty f-ing loud with no mufflers on the end of them.
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**Wed Aug 31, 2016 12:30 pm » Post: #3 » Download Post**

The stock chambers I have are super heavy so I for a while thought something was inside but I don't think there is... Honda used the heaviest steel they could find.

**Wed Aug 31, 2016 7:05 pm » Post: #4 » Download Post**

I had some OEM pipes gutted and welded back up... didn't weigh much less than stock! They worked well though. I'd go as far as to say, better than any aftermarket set you can buy, unless you really need a couple hundred RPM past peak power!

Stock chambers work better than every set of "race" pipes we've tested for the vast majority of configurations/conditions. As mentioned though, a pair of stainless race pipes with cans weigh about 1/2 a standard chamber... and they're shiny! Mr. Green

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Andy.
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**Thu Sep 01, 2016 8:46 pm » Post: #5 » Download Post**

I'm going to be designing and building 2 styles of pipes this winter.

I had heard the stock pipes are good, so I already have some ideas.

I have silencers on my OEM pipes currently, I'm not a fan of super LOUD exhaust note, but it didn't change much fitting different silencers on.

Good point about loud without end cans, telltale sign of no internal stingers.

I'd assume then the stock chambers are double walled, reason for being heavy, and how they deaden the raspy sound the stock exhaust lack even with glass pack silencers.

**Thu Sep 01, 2016 8:48 pm » Post: #6 » Download Post**

Forgot to ask Andy, did the OEM chambers have a stamped perforated sheeting in tailcones? Was there anything inside the ones you cut apart?

**Fri Sep 02, 2016 1:23 pm » Post: #7 » Download Post**

Strangely, only one side has perforations. We cut that section out and replated it. The pipes worked extremely well! Wink

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Andy.
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