Stock pipe gone loud

[jack_rides_stp]

hey

I riged up a little red light on the front of my 50 ( just so people can see me up bush at night)

But when I started it up it was a bit louder and deeper.

Anyone know why

 

[crazzy #1]

as a exhaust gets older it starts to foul up, this blocks up the exhaust hence making it louder