22.5 1500 zr 2 refresh

[Blue ZR2]

Hi, i bought my 22.5 with 4k miles on it, the exhaust looks stock like my friends 22, but when i get on it, it gets loud like it had an after market exhaust, i can keep it quiet or make it loud with the gas pedal, i dont see active exhaust on my window sticker, and my buddys sounds normal no matter how hard you step on the gas, any ideas?

 

[DNZR2]

Definitely aftermarket as the 22 did not have active exhaust or sport mode.

 

[ZR2BIZON]

Do you or your buddy have K&N stickers anywhere near the back half of the trucks? This will help us diagnose this conundrum. Also what color is the interior of your ZR2?