i have a 6spd i love sticks my other ride is a 5spd but im about to snork my jeep and im wondering if i shift underwater is my exaust gonna fill up due to the change in pressure?

 

I dont think the "change in pressure" will cause an inflow of water since to my knowledge mufflers have a type of flap to prevent intake ... (I could be wrong) however the problem with shifting underwater comes when debris and muddy dirty water gets in between your clutch plates. It wont ruin your clutch immediately but will definitely mess things up if you get something in there.

https://www.jk-forum.com/forums/jk-off-road-101-97/offroading-my-6-speed-93180/

I also have a 6-speed and that thread was hugely informative! Hope that helps and have fun wheeling.

 

thanks bud