I read the smaller pipe diameter on the CT required for that lovely low/mid torque. VFR1200F has a larger diameter, but to helps it on the low and mid range, it has a butterfly while our CT does not.
I went for the Akra because of two factors, finished product and sound. When the bike is to be delivered, I audition the Akra and had it installed since, so I really can't comment how the standard can feels like. My Akra can has a leak on one of it's rivet, claim from a dealer and they replace a new one, no question asked!
I installed a BMC airfilter when the bike clocks 20,000km. Now, my CT clocked at 21,500km. It felt better (of course, a diry 20,000km OEM filter vs all new BMC!), and I think, because I'm a bit confused as brain wants to believe it, the bike gets better mileage, + few points of a kilometer difference. Can spot the engine sounds gruntier than before.