I have Vance & Hines Monster Rounds that I find a little too loud on the highway after an hour or so. I put in Hard Kore Quiet Baffles and while they did quiet the bike down really well, for some reason they seem to contribute to popping on deceleration (more work needed to prove this).

I came across Cobra's slip on offerings when I bought my Cobra Powerport header. They have a really well priced (found for about $300ish) 4" slip on called the 909-Twin that supposedly enhance the low end rumble but are not particularly louder. If true this is the sound I'm looking for.

Anyone have any experience with these and able too comment on them vs. stock or the V&H MRs?

 

Just put a set of 909's on my 14 Ultra Classic. I was running some Full Boars with a 2 in baffle and Thunder Torque Inserts. Wanted something a little deeper sound, but not loud at cruising. The 909's are slightly louder, but not so loud you can't hear the tunes at a normal level. I'm running a Rush REC-17 head pipe. Very pleased with mine.

 

I have the Cobra Powerport as well as the 909's and really like the sound. At highway speed they mellow out and you can still hear the tunes or talk with the wife. My wife loves them as well. They will bark when you get on them. I think you will like the combination.

 

Ive talked with the Cobra rep and he says the 909 is there mellowest slip on.I went with crusher mellows myself.

 

Why does it have to be Cobra? Bassani DNT's might just fit your request

 

I too have been looking at the 909s. My bike is a 2016 Limited. If I install the Header pipe, will that void my warranty? I hate that damn Catalytic Converter, but don't want to lose my warranty. Maybe just have the Cat material pulled out of the header and stay with stock?

 

When I talked with a big company that frequents these forums about altering my stock fuel/timing map and would it then void my warranty they said I have far more to worry about removing the cat, (which I already did), than flashing your ecm.