Not Ranked
I can't comment on the difficulty of building an efficient header/collector system on a replica, but doing it on CSX3121 was a pain in the butt. Being something of a purist (even though I had a bunch of underhood stuff chromed), I resisted going to side pipes and had a header system fabbed up. It looked OK, but fitting it around the brake and clutch master cylinder mounting box was tough. In the long run, it probably wasn't a lot better than the horrendous stock, cast exhaust manifolds.
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