Saying one is better than the other is pointless until you have seen, touched, installed and driven both of them. OF which I have stated my case, the only objectivity I can lay down is build, weight, fitment and customer service are heavily favoring Fast Intentions.
I am thinking that Fast Intentions fitment is top notch due to the fact that they are made to order, not stored in any warehouse for x years, no stacking, moving dropping, rolling, the thing comes to you fresh out of the shop, in nearly the same shape as when it was built, not a knock on HKS but I bought my HKS in 8/2013 and it was built in 2/2011 for the front and axle back was 8/2011. Again, one of each kit is such a small sample size, but I am sharing my experience. My vendor did not care about this, Nor did the Japan distrubitor and HKS told me to contact my vendor, I was stuck with a franken-kit .
One thing about drone, EVERY exhaust will drone with TPs and no midipe resonators I run the CF 18" resonated kit with FI resonated TPs and have ZERO drone. Conversely my HKS with Motordyne ART pipes sounded like pure ****, raspy, more hiss, and had this garbled quality that sounded almost like detonation. Had the thing checked for leaks 3 times, nothing, no carbon leaks, nothing, had it for 2k miles.
Any exhaust will have drone, the HH phenomenom has it's limitations. Just like how any exhaust wil have hiss on this platform, any exhaust will have drone if allowed. Driving style is also a major factor of drone. While the HH resonator does do the best job managing this, it can still be overcome via test pipes, intake, driving style, engine load(ac/heat, accesory, stereo etc). The blanket statement "xxx exhaust has no drone" is almost as useless as "xxxx exhaust sounds better than everything".
Again, just sharing my observations as I have been lucky enough to own both of these great, and TOTALLY DIFFERENT exhaust systems.
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