Muffler delete vs resonator delete
 

I have a 2006 Range Rover Sport SC. I want my car to sound better, but not sure what I should do. Should I deter muffler or resonator? Or should I delete both of them?

I'd start with the muffler, leaving the resonator to even out the sound.

Okay how about straight pipe it from the cats?

I'd actually say resonator and leave the muffler. I've done this on two cars, one naturally aspirated (LR3) and one turbocharged (S60R) and both sound much better after without being overbearing. Mainly just louder when you step on it. From what I've read, removing the rear muffler may not have that much of an affect on the sound.