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Yoshimura RS-4 Installed

belrix

Well-Known Member
Nov 2, 2015
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SouthEast Kansas
Installed a Yoshimura RS-4 muffler on my AT today, very simple process just remove a couple of heat shields, loosen a couple of clamp bolts and remove the main bolt, voila! Just reverse the process to hang the new pipe. :)

Cleaned the can with rubbing alcohol and fired up the AT. Oh boy! That is a much different sound than the stock muffler, maybe too much. Time for the DB killer.

The included DB killer simply mounts into the rear of the pipe with a single screw, a quick 30-second job. Unless you dropped the screw down the pipe like I did! The good news is the catalytic converter stops the screw from rolling even further into the exhaust system but the bad news is my magnetic pickup tool isn't long enough to reach it. I had to remove the shields and muffler again to be able to fish the screw out of the catalytic. Getting pretty good at the process by now.

The DB killer toned things down nicely, time for a test ride

Spent the better part of an hour riding around getting a feel for the new muffler, below 4,000 rpm and riding smoothly it just purrs along, above 4k and with a heavy right wrist it gets downright nasty! :)

So far the RS-4 is all I hoped it would be!

Brian

PS the pipe just barely clears the HB pannier rackStock Muffler.jpgRS-4 Muffler.jpg

Sent from my SM-T713 using Tapatalk
 
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belrix

Well-Known Member
Nov 2, 2015
641
314
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SouthEast Kansas
I did record some video of me making noise with my new toy but my cheap cell phone mic did not due the pipe justice

Here is the link to the vid on Yoshimura's site that compelled me to purchase!

 
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belrix

Well-Known Member
Nov 2, 2015
641
314
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SouthEast Kansas
I believe from reading the Upshift article the above recording was without the DB killer. I currently have the DB killer installed but honestly don't notice that much difference.

Ordered the spark arrestor from Yoshimura today, curious how much the screen mesh will change the sound.

No gash in the tire, just dirty!
 

belrix

Well-Known Member
Nov 2, 2015
641
314
208
51
SouthEast Kansas
Find managed a decent length ride with the Yoshi muffler installed, about 150 miles a mixture of fast gravel and highway

I am suffering from mixed feelings about the muffler; it sounds awesome! and with earplugs, it is a nice soundtrack at 30mph or 80mph, without earplugs and at 65mph it is a little too loud in my right ear.

I need to have my buddy ride behind me and give his opinion.

Thanks!

Brian
 

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