I thought that the tubinecore was the same construction wise as a powercore with the added bonus of the built in arrestor. I think the sound would be so close to the same you couldn't tell the difference.
I run the tubinecore on one of my R's and an answer with Cobra Sparkey on the other and the FMF is way quieter.
Ross..
My Rides
1985 250R original (Garage Queen)
-under restoration
1985 250R black and blue full rebuild ( Daily Rider)
-Paul Turner pipe
-+2" Westcoast
1985 Red and White Tecat-EH Sold
1985 Green Tecate Sold
My Wife's Ride
-2003 Suzuki LTZ 400 Showroom fresh and completely stock
My Kids Ride
-2004 Yamaha Blaster, Completely Stock
-2006 Yamaha Blaster, Completely Stock