No, if you delete the SS the interior cabin is much quieter. I found that I missed the noise, so I put mine back on. I think with a catback exhaust and a CAI, you'd get more engine noise. And you'd hear more turbo spooling.I think the sound sympser delete changes the noise level from inside the cabin... to louder. I am a newbie so that's what my guess is from what I have read.