Basically, the intake is only worth the $500+ if you are boosted. Only really helps in top end, and would be a great alternative to the stock plastic manifold if going for high boost.
The header does make more power than svt exhaust manifold, but that $800+ could be spend on boost. The TS header would be great for a supercharged svt.
All in all, you probably won't be satisfied without some sort of F/I.
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