Yes, it goes back to stock 100%. No rattles, no whinning, no sound but the stock muffler. Most of the older or manual valves dont close all the way or rattle, but these are really good.
Cudos to you...It's a good thing you did not second guess yourself and nix the idea.
Enjoy!
__________________ http://home.comcast.net/~jmpfleet/Cars/m3r.JPG Current - 04' M3 SMG Convertible SOLD - But never to be forgotten 98 Boxster
Stock w/19" Wheels, stealth K40 front and rear