What spintech is that, also that header looks like the banks torque tube. whered you pick it up?
I picked the header up off of CL with 50 miles on it for $140, the guy had the receipt from Morris 4X4 for $360 shipped. Its made by Rough Trail, a division of Crown Automotive. This header and muffler combo 2.5" header back made my throttle response unreal even with a stock air intake, cant wait to build an intake with a pod filter now! The model Spintech is a Sportsman Street 3000, this is what the rep at Spintech recommended for what I wanted as this Jeep is not a DD.
I am most likely going with the same exhaust diameter and I already have a Magnaflow High flow metallic core cat for my MJ. I was considering the spintech 9000 series for mine (it is the smallest one) since I need as compact of a muffler as possible. I'm also planning to heat wrap my header and down pipe all the way to the cat.