anybody look at Litespeed Racing? its basically a Titanium resonated straight pipe they claim exhaust weighs 14lbs excluding the Y-pipe as far as i can see sent them an email. its pricey 3600 or so but -40lbs and adding 14whp and 16trq (Dyno sheet on website) could be a recipe for success. Loud i would bet though good for a track car haha
370z Full Titanium Race Exhaust sounds pretty good as well