Is your wife bothered by the noise level, or the tone? Something as simple as an exhaust tip can change the exhaust sound. Many years ago, before my studies in acoustics, I was amazed by the change when I temporarily removed the big rectangular tips from my 'Vette's OE exhaust. Without the big tips, the 454 sounded like a punk, and with them it sounded like we think a 'Vette should sound. The big tips were ugly, but they worked as the designers had intended.just installed a magnaflow catback dual rear exit on my 04 Sierra and I love the sound but my wife finds it a little loud...any way to tone it down a little?