When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Let's look at what an X-Pipe is installed for.... It's to equal the pressure between the two pipes..... And doing it with the least amount of restriction as possible. If you dump both pipes into one like bassani and magnaflow you're creating back pressure and or restriction.
The only one of the three shown that doesn't restrict but still relieves the pressure is the CORSA
Check out the dyno graph of the Magnaflow X-pipe on their website: http://www.magnaflow.com/03cat-corvette.htm. It loses power throughout the RPM range, and only gains power at the very top end. Thus, the total area under the HP curve may be less, so net HP difference could be a loss over the stock H-pipe (hard to tell with their strange/non-standard dyno graph).
The best X-pipe will be the one that creates the least turbulence/backpressue and is pulse-tuned optimally. The dyno graph should show very little loss down low, and gains from mid all the way to the top of the RPM range (for a net gain in HP over the stock H-pipe, or minimally no net loss).
I'm prefectly happy with the sound of the stock H-pipe on my 2002 ZO6, except when it jingles/pops/backfires (which the X-pipe remedies).
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.