Ok so why do you need "bone stock"? Is it the axle-back area you're having trouble with? Unless your jig car has its custom exhaust running *under* the axle, you should be able to build it on his car. Like I said previously, you shouldn't be making us FULL exhaust anyways, just axle systems with a two-bolt flange at the cat end. Because our swaps are always done a bit custom for every car, we'd still have to sort out the DP but that's easy enough... you either hammer your floor like I did and run a stock S13 DP, or you cut and lengthen the manifold end of the DP. Either way, that's something we usually do with a prefabbed mandrel-bent EBay SS DP.
A nice axle-back system. I know some of you would like to get something shipped to you from UPS or FedEx that you can just "bolt on"... but the only way that would be a good idea is if the majority of our cars came with the same engine and most of us kept that engine. MOST of the S12's out there are CA20's, around the world. These get swapped for KA's and SR's depending on where you're located. And the SE's are only here in the States and not very numerous.
Making an over-the-axle section lets us pick our DP, muffler, and get things where we need them to be under the car. Sure, a lot of people would still need an exhaust shop to weld on the muffler and cat flanges, but my point is that's not expensive at most shops, but fabricating a perfectly made axle section is.
SO... yeah, while a full exhaust sounds like a cool item, it's just not feasible for our cars IMO.
Make us an axle system, off of whatever car you have access to. Having seen your professional welds, I have no doubt that you can do it without the presence of a bone-stock exhaust. Besides, the stock muffler is weird and both inlet and outlet are pointing INWARD towards the car, so NOT a good frame of reference at all.
