I have heard that the 4cyl mx-6 and probe came stock with a header. can anybody verify this and if so OBDII screwed me again. because I pulled the head sheild off to look and it looks like any other factory exhaust manifold.
They don't. If you were replacing a poorly designed (from a performance perspective) restrictive factory exhaust manifold, you could get up to 10 hp. But with a well designed, high flow factory header like ours, any power you might free up by replacing it would me minimal, especially with a stock ehxaust.
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