370ZYZFR1

I have read tons of posts about cbe and have narrowed it down to
Fast intentions and hks.

I really like the FI but really worried about drone. Hks sounds excellent but not as deep as FI.

If I go FI I would so 18 inch resonators with hfc

If I go hks I will peon do hi power with motordyne art test pipes

Questions
-from what I read sounds like hks will be a bit quieter?
-sounds like with FI there is moderate drone even with 18 inch resonators ?
-if I do hfc, is that that quietest cat replacement I can do?
-no drone with hks?
-will motordyne art test pipes fit with FI cbe?

Oh please vote!