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I ran a HKS replica for awhile and it came in and out many times, I hated that double flange... Had to reuse that gasket... Also not an easy exhaust to pull in and out all together... Yes, it is $400 new, not a terrible exhaust, and I think that the replicas are actually a bit better design at least in the H pipe. I had long tube headers but I was never really happy with the sound of it after I installed them...
If you are looking for a cheap exhaust, just buy a new replica off ebay