I have been hearing a lot of rattle from my waste gate. I know this is a common problem with the 08 N54 engine and since I'm still covered under the extended warranty, 8 years or 83,000 miles, I'll be taking it in next week. I do have JB4 and OCC installed so I'll be removing the JB4. My question is will I have to remove the OCC also when I take it to the dealer??