Don't know, but don't think Naraku Traffic significantly better than good stock pipe, but would be better than one with restrictions.
I know from reading People 50 mods (any posts by Art have lots of good info, if you get a chance to read them) that earlier pipes before certain year, maybe 2005 and before don't have restrictions and work very well. I have 2005 People 50 and it's pipe doesn't have any extras on it, didn't have to do anything to it, and seems to work great, especially from dead start at red lights I always jump the cars.
I have Tecnigas Next R I will be putting on People 50 and will be interesting how much it improves, if any over stock pipe. The People 50 with stock pipe is actually better at takeoff than Super 9 with Tecnigas pipe, but Super 9 has more on top end for sure, I think makes more HP but less torque than stock pipe. I will be trying pod air filter too, to see how much that helps, but so far main difference is a lot louder!!! Maybe a good stock pipe and pod air filter is a good way to go?
I had the chance not long ago to pickup good stock pipe on ebay for approx $100 and didn't get it, wish I had it now. Cheers