I think it's just because the cars rev slightly when cold to warm the engines up quicker. My Strad sounds a lot louder when cold with valves open but then the engine slows down after 30 or so seconds and the exhaust not also goes quieter.Hey a quick question for you GTS owners. My exhaust valves are open all the time because I have disconnected the vaccum hoses.
However I note that it is always much louder when I cold start. I want it like that all the time as it sounds epic. But after 30 seconds or so it reverts back to the normal 'open' valve sound.
My valves do work as I reconnected the vacuum hoses to check and its quiet with them closed, louder when open, and louder still when cold.
Any thoughts as to how to get the louder sound?