I've got 98 5.7 and I put the Volant on there. Pros: looks, price, bit of power bump (butt dyno only). Cons: quality design/construction (issues with the filter install being a tight fit and another issue with the design of the hold down bolts to the TB. Was so horribly designed that i could not even use the ones they sent with, I had to come up with my own solution to finish the install, have to clean/oil every 10k or so, won't give you a huge power boost if that's what you're looking for.
Pics of mine installed can be found if you look under my profile for threads i have started (look for "my simple suburban"). I'd attach here but not sure if I can...
Let me know if you have specific questions on the Volant. Happy researching, Greg
---------- Post added at 09:35 PM ---------- Previous post was at 09:34 PM ----------
Oh, and to answer your final question: to me, yes, it was worth the money. My stock intake was restricting the engine so bad at 5500+RPM that it would shake and bog down. Not anymore