I bought the Big Louies for my Road King and love the sound. I have the Slash-Up with the SB2 baffles which are stepped down 3->2.5 The videos online are accurate. The SB2 baffles are not obnoxiously loud but still have a nice deep rumble. Of course they open up nice when you get on it.

 

True on sound clips. I have them on my M8. They are much louder on my older twin cam bikes. My 2011 and 2014 limited's were decatted and with 2" baffles were louder and deeper sounding.

 

Any updates on the Big Louie's? I am leaning towards these.

 

They get louder with the Rush 7017HO headers I have both on my 2016 SGS and like them

 

Yeah I'm still happy with them, glad I went with them. Good luck

 

Mine just came in yesterday. They were on backorder almost 6wks. I ordered the extended tips due to the extended & stretched saddlebags on the bike. They are the 4030B extended tips that match up well with the Big Louie 4"
slip-ons. They extend a tad more that I thought they would but I like the look of the rear of the bike better now. And they sound damn good too. Glad I chose them. May have to add an extended Bagger rear fender now. Here's a couple pics.

 

I'm considering the Big Louie 4" slip on. Question: If you keep the stock air cleaner and header do you need a tuner or can you keep the stock tune?
Thanks!

 

[QUOTE=SomeOld Biker;16524319]I'm considering the Big Louie 4" slip on. Question: If you keep the stock air cleaner and header do you need a tuner or can you keep the stock tune?
Thanks![/QUOTE

Stock tune with slip ons is fine