I think with under car exhaust, you're moving away from the crazy loud cobra sounds anyway. That would lean me towards the coyote. It will still sound nice I'm sure. You might even be able to speak to your passenger
I'm surprised no ones mentioned the t5. I assume it needs beefing up for either motor. I also believe tko600s don't even want to spin/shift behind a coyote pulling to 7000rpm, without mods. Maybe those mods arent a big deal? Maybe someone can add to that.
Mat