for us clueless types with respect to exhaust styles/sizing for tuning sound/tone at different speeds, where the heck do you start with learning those details? would i just start with talking with someone like catback directly, for example?
what does "WOT" mean?
In general though, turndown exhausts(like the one I have) before the rear axle sound a bit more bassy in tone when you're in the cab due to the sound bouncing off the ground. They are more susceptible to drone(that unbearable deep BUZZ that resonates in the cab) at cruising speeds if the components aren't chosen carefully---the bigger the muffler canister = the more sound deadening material = the quieter your exhaust will be. Exhaust tip size on these style exhaust systems, as I've learned on my previous Tacomas, really does affect sound as well. The bigger the tip, usually the deeper the tone. Most people don't realize that. Unless one simply prefers this style of exhaust, a turndown before the rear axle has it's purpose as well....to help clearance for rear suspension mods.
"Over the axle" oem style tailpipe exhausts that where the exhaust tip(s) sits behind the rear tire are less susceptible to drone. Usually higher tone and more rasp at wide open throttle(WOT). This isn't a bad thing either. Most people go with this style as they are direct bolt on and with much more options in the aftermarket.