Originally Posted by capplegate
The noises you get when letting off the gas
If you mean the popping or backfiring sound you get...no, not really. "Real" baffles might help, a little. The normal causes of the popping/backfiring sound can be an improperly adjusted air-fuel mixture, an exhaust leak at the heads, improperly jetted carb or maladjusted fuel injection computer.
For example, when I bought my bike it had aftermarket pipes (with baffles), but still had the stock air box and stock jets. I had popping on decel, which I halfway fixed when I replaced the exhaust crush gaskets. Apparently, whatever idiot installed the pipes did not tighten down the pipes properly so I had an exhaust leak.
When I put in the Thunder Air Kit, I also rejetted with a Dynojet kit, and adjusted the air/fuel mixture screw. That eliminated all backfiring.
Even when I removed the "stock" baffles, I still did not have any backfiring, but that might be because my pipes are double-walled. the interior pipe that actually bolts to the head is about half the diameter of the outer pipe, which is 2 1/2 inches. Also, the inner pipe only goes half the length of the outer pipe. So, the last half of my pipes is 2 1/2 inch chrome open pipe.
All the lollipops do is restore the back-pressure, HP, and torque that is lost when you run open pipes, without quieting down the pipes.