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air box is good for a solid 10rwhp. not a huge gain, but a noticeable power increase. I'm not very familiar with X-pipes, except for they are supposed to "smooth" out the sound - decrease popping, etc. I have the Borla XR1- to which an X-pipe is not applicable, so I never really looked into it.
I think the comments above are correct. The airbox (blackwing, vortex) would give you the most hp at maybe 10-12.....you will feel greater throttle response also. The Corsa exhaust is and always has been a great piece, and unique sound, and they truly stand behind their products. The x-pipe is a mixed bag....it calms the uniqueness out of the Corsa system, but at the expense of the WOT roar. Several forum vendors sell Corsa/Blackwings at great prices also......which will make all your choices even sweeter. :thumbs:
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.