There are a ton of knock-offs of Racing Beat's design on eBay. Truth is, there is minimal power gains with this header design. Its a great part by all means, and DOES yield a few more HP over the mid range on up... but the real savings in my opinion is weight and temperature control.
If you want to see decent gains on a header on this engine, it needs to be a longer tube design collecting farther back than the factory mating locations allow. That means custom, and that means big $$$.
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