What catbacks have tailpipes that follow the oem routing?

Not anymore really. You might find a few no-name brands out there but the EPA is cracking down on cat-delete exhausts and handing out fines.
I was at SEMA in 85? The "test pipe" business was going strong.. Those were the pipes made to fit where the Cats went, so you could " test" if the cat was any good.....
 
I’ve had the LMR pipes on my car for 3 years. They are equal to the stock tail pipes as far as build quality is concerned. I didn’t lay them beside the stock ones to compare, but it looks to me like they follow the stock routing and use the stock hangers. I can get measurements if someone has specific requests.
 
Same goes for H-pipes.

I have a crappy Pacesetter off-road H-pipe that was 2” shorter than the Oem h-pipe and would hit the x-member

My bassini x-pipe with cats fits much better despite being physically bigger.
 
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