06 FXST 2into1 exhaust systems

Anyone out there with any direct experience with the Cobra HP 2-1 exhaust system?
I have an 06 FXST, 95 inch kit, SE air cleaner, cylinder head work and the S&S 510 gear drive cam set. I am currently running the Rinehart slip on mufflers and wonder if the extra performance with the 2 into 1 system would be worth the investment. Is there in fact a measurable increase in torque and hp with a 2 into 1 system? We have a multitude of choices out there as far as exhaust systems go. I am just trying to narrow things down a bit. Thanks!

[hdnt1550]

I have V&H big shots with a power chamber that links the 2 pipes so you get the same look as a 2 into 2. The 2 into 1 setup equalizes exaust pressure and tends to make more HP.

[kenk]

I have similar work on my SFD and was amazed at the difference a two into one makes. I am currently running with a thunderheader exhaust and couldn't be more pleased. Up 9 hp and 11 foot lbs of torque....Kenk