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Header wraps cause crevice corrosion on stainless steel piping. If you're dry all of the time this shouldn't be an issue. Heat shields are more effective, though. If you follow that route. Copy what modern cars do. They routinely pack hot exhaust systems in cramped places.

Less back pressure is always better. On a naturally aspirated motor the high energy exhaust pulses in small tubes travel at high velocity which reduces their pressure (Bernoulli). A turbo engine benefits from no such effect post turbo. Bigger shorter straighter is better. With that said, I don't...