This exhaust is the best of both worlds in my opinion because it is throaty and mean at hard acceleration and during cruising there is no difference between the two. I was worried before I bought it that during normal driving that there would be a drone in the cabin, but there is none, even with the windows down. You will hear a difference at startup during idling, but it is an improvement.

 

I just installed my GHL last night. It was a very simple install. I love the new deeper sound of my Z. I will dyno later this week to see any HP/TQ improvements.

 

Looking forward to it. I'm trying to decide between GHL and the new upcoming Borla "True Dual".