Kooks race bullet

Anybody heard these mufflers before??
http://www.summitracing.com/parts/KOK-R300-10/

Im going to be switching my x pipe to a y pipe and was thinking of taking one of my SLP's and making the loudmouth catback. But i saw these on summit and wasnt sure if anyone has heard them before?

I had dynomax bullets before but they were too quiet for my taste. Are these kooks race bullets similar to the dynomax bullets?

Those look like the mufflers they run in their true dual setups. I cant believe how cheap they are though.

i noticed that too which is why it caught my attention. They're true dual setup is like $1800 when you can buy the summit narrow bend x pipe, 2 of those kooks race bullets and the dual tips and have the shop do the rest of the piping for way way cheaper