S&S MK45's installed - Road Glide Forums
Intake and Exhaust Intake and Exhaust Systems for Road Glides

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post #1 of 11 (permalink) Old 01-09-2018, 12:15 PM Thread Starter
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S&S MK45's installed

Finally got some decent weather to install the new MK45's on the 2017RGS. Also put the db reducers in as well. They sound great compared to stock and just waiting on the K&N filter to show up via UPS today so I can flash the ecm with the SEPST. Should be able to get it on the road tomorrow before the rains show up but initial sound is great. Great to have new clamps and bolts from S&S and basically a simple install. Of course getting the mufflers lined up equally was the last bit of the process but they look great on the bike.
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post #2 of 11 (permalink) Old 01-09-2018, 02:22 PM
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Let us know how it all turns out

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post #3 of 11 (permalink) Old 01-09-2018, 04:30 PM
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And please post some pics - the S&S Mk45s are awesome. I believe the db-reducers are what you need for those long hours on the road.
What type of K&Ns did you order?


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post #4 of 11 (permalink) Old 01-09-2018, 11:21 PM Thread Starter
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I ordered the HD 1717 which is quite a bit larger than stock and the flash will be needed since I have another local rider that has a similar setup as well. I'll get some pics posted once the weather is a bit more cooperative since we have rain the next couple days and then back to winter type weather. I've got a laptop and the tuner so it's a simple job to do. I decided to install the db reducers first and see how that goes but the deep tone is definitely there.
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post #5 of 11 (permalink) Old 02-22-2018, 11:57 AM Thread Starter
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Finally got a couple decent days to ride and the pipes are awesome. One ride with the db killers on and another day without and it's night and day difference. The db killers will be great for the longer rides on the interstate trips I have planned but the deep tone is great and not obnoxious at all. They definitely get the deer out of the way in a hurry from a long way off and that stage 1 tune installed works great. I also installed the DK customs diy breather kit and just hid the catch can behind the stock cleaner. I can hear a bit more intake noise at low rpm but it will be nice to keep the intake clear of the misty crap. I had no issues with the pipes dragging in a couple tight corners and this weekend will be testing it on the Snake over in Shady Valley TN which is close by and new asphalt with lines at last. Now I'll be waiting for the warranty to go and then install the fullsac mx pipe and probably a woods cam setup to really wake it up.
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post #6 of 11 (permalink) Old 02-22-2018, 12:51 PM
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Sounds great, post up some pics of all the mods and finished product.


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post #7 of 11 (permalink) Old 02-22-2018, 03:07 PM
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Out of curiosity, why are you going with the SEPST? It does very little and you voided your warranty with the exhaust anyway, so why not get a tuner that does something outside the strict EPA guidlines?
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post #8 of 11 (permalink) Old 02-22-2018, 07:07 PM
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So long as the stock headers are there, there's no issue with the warranty. And the HD tuner is fine depending on how far he wants to go. If just a stage 1, and that's about it, the SEPT is a good way to go. now if you're planning lots of motor work down the road... then maybe some aftermarket tuner is the way to go.

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post #9 of 11 (permalink) Old 02-23-2018, 08:17 AM
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If you can get that in writing from HD, I'd be shocked. There are stories everywhere of people's warranties being voided by HD for slip-ons, not just full systems. If it were me, I'd put the stock pipes back on before bringing it in for service, once the dealer notes in the system that the exhaust has been changed that information goes straight to the mothership and every dealer has access to it.

He said that he plans on upgrading other things when the warranty runs out, the tuner should be one of them.
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post #10 of 11 (permalink) Old 02-23-2018, 08:46 AM Thread Starter
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The mods I've done so far work just great and the tuner works for what I need it to do. I've had no issues with the thundermax and daytona twin tec tuners on other Harleys I've had but this M8 works great as it is. I've had plenty of fun racing sportbikes,motocross,enduros and messing with the Harleys for performance. I've ridden the new Cvo's and even a 117 upgraded CVO M8 but its still a touring bike in the long run and I'm fine with that. The fun of having a motorcycle is to enjoy it and make it your own and that seems to have been lost in translation.
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