So I get out there, and he's got the OBDI E36 M3 pipes and cats temped up under the car where they're going to go. The X-pipe and cats are hanging WAY low, but I figure it's just temped in place and he will sort it out. So what he does is this. He welded two 3" long pipes between where the M3 pipes meet up to the headers, no flanges or anything to make it removable. There are HUGE gaps almost all the way around the top of the connection, so there's a huge exhaust leak, and the whole system is still as loud as it was with open headers.
Next, for a hanger in the middle, he welded a piece of steel strap to the pipe, ran it through the opening in the rear subframe where the diff/driveshaft passes through, and then welded the other end back to the pipes. So there's just this piece of steel strap hanging loose through my rear subframe holding the pipes up.
Then, at the muffler, he didn't tuck the muffler up into the cavity under the rear valance, he just welded it straight and level off the M3 pipes. At the tips (the inlets/outlets on the Magnaflow are kinda far apart), he didn't do any kind of sweeps to space them in toward each other, so the tips are just tacked onto the outlets, with like 3" of space between them.
On top of that, there was NO room for the 02 sensor to thread into the X-pipe where it goes, so it didn't get threaded in properly. About halfway home, it rattled itself out of the bung, and bounced along the ground the rest of the way home, pretty much destroying it.
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