Turner Test Pipes (basically a primary cat delete):
1. Minimum Drone - no drone whatsoever, sounds like stock inside the car in daily driving, under WOT the exhaust note has a more aggressive tone with a slight rasp (you mentioned no rasp but rasp is very common for exotic cars).
2. Power - power gains feel very similar to Akrapovic, but without the torque dip @ 2500rpm observed with the Akrapovic
3. Exhaust Note - really close to stock, I like the character of the OEM exhaust note, this approach keeps the character with more aggressive note under WOT
4. Price - won't cost you more than $500US