Mr2Envi
Been here awhile...
I see 997/997S tips from Evolution Motorsports on eBay for $349 - is this where you purchased? What is involved in installing them? I recall reading elsewhere on genesisowners.com that there isn't much pipe left after you cut off the stock tips.
I got them used off ebay for around 120 bucks shipped. They are just long enough as long as you cut only the stock tips off and not touch much of the pipe where the new tips going to be welded on. An exhausts shop can extend it to the lenght you desired also but it was just fine for my taste.