Quote:
Alex (UK) said:
I had 2 types of rattles, both can be heard when in stock configuration and with the hack...
First: Loud rattle when the valves in the left muffler were opening/closing. This was most noticeable in Sport (PSE on) when doing constant approx. 50mph in 3rd gear. This issue was fixed by my OPC opening up the muffler and adjusting the valves so they didn't stick when opening/closing. They tried replacing the whole muffler on warrantee but the 2nd muffler had the same issue.
Second: After fixing the first rattle I got a more general quiet rattle from the left underside of the car. This was most noticeable with Sport off (PSE off) as you could hear better. It was independent on speed or gears. This was fixed by my OPC last week, but at the weekend it came back, shortly before disappearing again this week (may have something to do with me having the always-on hack put back so drowning out the sound!)
I will take the car back at some point to get them to fix this once and for all. I don't think any of these rattles are hack related though as they are just as prevalent without it on. I had these issues from day 1 so I don't think the hack had time to cause any 'damage'.
First, the PSE valves are not located inside the mufflers. They are located in the bypass pipes , OUTSIDE of the mufflers.
So your OPC gave you a BS line if you were told they had to "open up " the muffler to adjust the valve.
The mufflers are welded shut and you don't just cut them open ( And I doubt the average dealer has the facility to weld st. stl. mufflers)
You are correct with your second statement . If there is a rattle related to the butterfly valves, it is most likely NOT due to the "hack " ( disconnecting the pneumatic tubes or the electrical plug ) Either one just keeps the normally open valves from closing ,therefore having the bypass open all the time.
Most likely , the valve spring( which keeps the damper open )is binding somewhere,or is weak, and therefore the damper will rattle open/closed due to the exhaust gas pressures (alternating first from the muffler and then from the other exhaust pipe side)
One should keep in mind that metals , especially spring steel becomes weak fairly soon when exposed to constant extreme heating/cooling conditions.And the exhaust pipes get pretty hot. Considering the location of these valves, I am surprised they work as long as they do.
Btw: to all who have " disabled " the valve operation .
Keep in mind that the valve dampers are located inside the exhaust pipes. If left constantly in the same position , there may be enough (soot ,crud ?) accumulating around them over time to prevent them from operating again when desired .
I would occasionally let the dampers cycle open/closed to keep them working properly
(but that's just my opinion )
.. .Been dringing around with a big grin 
on my face a couple of hours earlier today 
