Here's what I have had on my 2018 Road Glide Special:
1. CVO mufflers with FULLSAC baffles - not much better than stock IMO.
2. SE STREET CANNONS - Better than stock, with some decel gurgle.
3. Bassani DNT Straight Can slip ons - Nice deep tone, better than stock; not very loud but a good rumble getting on the throttle.
4. TAB slipons with Zombie baffles - Pretty nice sound on throttle not too deep though, sounds mean when on the throttle, not obnoxious; 2.5 baffles are better than stock, easy to cruise with, not obnoxious.
5. SS MK45 slipons - very nice deep tone with stock header. Ran these with the FM headpipe and it sounded pretty damn good. Only a little bit louder with headpipe; head pipe not worth it for the stock motor, IMO, probably more beneficial with cam or other motor work.

Coming soon - Fuel Moto Hi Roller slipons with stock headpipe.

 

Street Canons..they are just fine..and I sure don't have the kind of budget for experimenting as you do!

 

I had the street cannons on my 17 FLHTK and they were ok just a bit too quiet for my liking but definitely better than the stock muffs for sure. Especially after they were on there for 1,000 miles or so. Then I was gifted a new set of 4" Rineharts. I really like the rineharts, deeper sound and better sound under acceleration but not obnoxious to the rider while cruiseing done the highway.

See the following for a sound clip: https://www.hdforums.com/forum/new-r...00-0106-a.html

 

I dont think ANY M8 can be obnoxious cruising down the highway. The motor is just designed to be quiet at cruise.
Change my mind.

 

All subjective i know, but just seen a guy post on FB a M8 117/ RS472 build with a RB Racing Pro Stock Spyder 2-1
Sounds awsome, not a youtube vid so no idea how to do a link

 

We have Vance & Hines power duals with eliminator 400 slip ons, and Rinehart 2 into 1. They both have a nice tone to them, deep and not over powering. No heat issues. There was no performance gains in either bike, both have stage 1. I will be putting a cam in mine this spring and swapping the exhaust to the Rinehart 2 into 1.

 

I've tied stock, then V&H HO 450s, then Tab with Zombie baffles. I liked the Tabs the best for louder and bark, but I agree that they weren't deep enough. Next time you're bored, throw on the Tabs, pull out the baffles and install Thunder Torque Inserts from DK Customs. Man... what a difference! Without a doubt, that's the way I'm keeping mine.

 

I believe it, but dont you lose a little low end torque? I would think the inserts wouldn't provide enough back pressure for the M8.

 

2017 SGS
1. Street cannons
2. RCX 4.5
3. Rush Big Louie
4. S+S MK45
5. Tab zombie
6. Magnaflow Hitman

2019 CVO SG
7. Magnaflow Knockouts

 

Quik, you like the Knockouts better than the Hitman? Deeper sound?