Hello i have a question for ya'll. I have a 2016 Street Glide Special 103 with vance hines fuel pack 3, RCX slip-ons, and aftermarket header pipes of an unknown make.(no cats) Bought the bike this way last year. Just recently the exhaust note has changed on my bike. When cold the bike has the nice rumble and growl that we love from our bikes, but after 30 mins of riding or so when you accelerate or let off of the gas the exhaust sounds really raspy and the decel pop sounds like crap now cause of it. almost as if you took two pieces of paper, put them together and blew in between them hard. It's worse when you have barriers or cars on both sides of you. (sound bouncing off of them making you able to hear it better) sounds horrible. Even at highway speeds accelerating does it as well. When at idle it acts as if the bike has a miss and almost smells like a exhaust leak. I just had service at the 15k mark and with that had new plugs and everything checked. i'm at 18,110 mi now. iv'e looked at everything to see if it's loose, placed my hand near the pipe connections to see if i felt some exhaust blowing by...nothing. I'm at a loss as what this could be. When bike is warm is the only time this happens. bike rides great and accelerates just fine but it doesn't sound like it used to when i first got it with 8k mi on it. Any help on this would be greatly appreciated. Thank you in advance.

 

You might want to re-flash your setup on the FP3. You might also want to set the decel pop on your FP3. See link below:

 

Check the packing on the baffles. Can and does deteriorate. Have to pull em to see. JMO.

 

Pull the heat shields and check the headpipe for cracks where it's welded together. Pipe heats up and expands, making the crack worse and causing the issues you describe.

 

Thank you all for the info. I found the issue(s). 1st all 4 head pipe to head bolts were loose. 2nd, the lower heat shield on my right side exhaust pipe had a broken bracket so it wasn't tight. will need a new lower shield. and 3rd the crossover pipe clamp is gone. how i have no idea but it is. took care of the 1st issue today. once i have the crossover clamp on i will retune the bike, pull the baffles, inspect and set decel pop to mild. Thank you all for the help. i always check the bike but somehow i missed the bolts being loose and clamp missing. will update later in week once i have everything fixed to let ya'll know if this indeed fixed the issues.

 

ordered parts and just waiting for them to come in. Hopefully they come in quickly.