Three items to keep in mind with how loud the exhaust is from my personal experience:
1. Stock vs. Long Tube headers
2. Use of a Y pipe vs. true dual exhaust
3. Catalytic converters.
I went full blown long rube, no y pipe, high flow cats and no muffler and tied back into the existing rear pipes over the axles and stock tips. Local law enforcement thought it was a bit loud. At launch my 6liter 6speed drowned out any Harley.
I put a magna flow straight thru on each side and it is now quiet enough to not cause problems but is still loud enough to get attention from the police during hard launches
Just my experience...
I've been waiting to make a (point) relative to this topic. Frankly, I have the two into two magna flow and the results are fairly tame and I'm looking for more.
But when I get it to "bark" a little more, I (for one), will try to be considerate of my fellow SSR fanatics when we're booked into the same motel/hotel spot.
Case in point..............MAGGIE VALLELY----( 2018 ). Our room is located on the front side near the end away from the motel entrance. For what ever reason, many SSR attendees make the decision to (back into) their parking spot. Translation...........The exhaust pipes are pointed directly at the bottom floor windows.
Now, add in those that are (early risers) and at the end of the event, they want to get going but it seems they feel the need to "warm up " their ride and maybe take the time to plug in routes on their GPS units..............All the while, disturbing and creating (noise and exhaust fumes) via the room units a/c unit..............
My message is..................Crank it up and move on out of your parking spot for your "warm up" and/or GPS input or what ever else you need to do before leaving the premises altogether.