An engine with fuel injection might be able to adapt to the fuel mixture changes needed when switching from a muffler to an open pipe - the carb on the Savage can't.  If you jet the carb to run with the muffler....it won't be jetted to run with an open pipe (the Savage engine doesn't run well with an open pipe anyhow).

I am not a fan of open pipes on anything....even your lawn mower.  It really promotes folks developing the wrong attitude toward us bikers.

In my crystal ball I see burnt exhaust valves in your near future!!!  

In the open position you might as well get off and push.

Just curious , Where did you find that and how much does it cost ?

Ruttly wrote on 04/26/17 at 18:34:08:

I've considered one of these cut-outs.  However, John Law would probably fine you if he caught you with one.

If you have some fabricating skills, it would not be all that hard to alter a muffler with a removable core to have a "dual" type of baffling.

There could be a butterfly plate in the pipe going through the muffler, and in the closed mode the exhaust would pass through the perforated center pipe - in the open mode the exhaust would pass straight through.  The butterfly could be manually operated with a cable and spring......it would be a bit more complicated and expensive to make it electrically operated.  Quite a few modern bikes have a butterfly in the exhaust to provide the needed restriction at low engine rpm, and you could source one of those header pipes to get the valve and spring.  In the "open" position it would still be possible to have some baffling in the center pipe so that the system would not be a straight pipe and provide the needed obstruction to the pressure waves (reversion) that makes the engine run so poorly.

Is it worth the effort to build one......I don't think so.

Dave,reversion waves don't make the motor run poorly.They make it run better. The waves reverse when they reach the end of the header pipe and return as a negative pressure ,if they reach the exhaust valve before it closes (during valve overlap ) it pulls the remaining exhaust gases out while helping to pull a fresh fuel in,  this is why the header length is important. If you run a muffler with no baffle or a straight pipe the reversion doesn't occur until the wave hits the end of the entire system,and arrives back at the exhaust valve to find it closed.the wave leaves the motor at the speed of sound (mach 1) but the exhaust gases travel at a much slower rate, as they give up heat to the header pipe /muffler they slow and also slow the reversion wave on it's return to the exhaust valve,which is why a gutted muffler or straight pipe hurts performance.