I call BullS**T on that statement.lazerx said:The guys at my local dealer in philadelphia said they couldn't sell me a gransport exhaust because they had to protect the exclusivity of the gransport owners.
I have a Non-GrandSport Spyder with the GrandSport exhaust. The Service department warned me that I might be unhappy with the sound level due to the open cockpit. Obviously the valves are always open since I don't have the vacuum connection. To me, the pipes are still a tad too quiet but I am not unhappy with them. They have a sweet burble on downshift.
If I had a Coupe, I would probably want more sound.