the mid muffler is a basic hurricane round 3.5" muffler, the resonator has been cut off same cat back (HKS Priest) and the sides trimmed till the pipe work became 3.5" the rear muffler is a massive HKS Priest muffler which isn't really 3.5" more like 3.25" but good enough.
Funny enough, when the gate cracks the exhaust gets even quieter.. (it's plumbed back after the cat) like so (old pic, all the shit is wrapped up and also the wiring has been cleaned up):