Thanks Brotherhaha, you'll hurt no feelings here. and you'd be hard pressed to be more tech challenged than me!
on the pmd and it's spare- I say mount both right next to each other on the front bumper. get a dummy plug and fill with silicone, ltteing it dry before install. then when one fails, you just move the wire over and get going in seconds. then at home you remove the faulty one and sebnd back to Leroy since his are lifetime warranty.
yes 4" exhaust kit- you'll get to know Leroydiesel.com well... ATT and a tune to match- again Leroy.
Much more later....