Need to get my DPF Filter cleaned. I can take out the muffler looking thing that holds the filter. My question is do I bring that whole thing to get baked? Or do I need to open it up to access the filter? For last two days we have run the dpr at least 5 times per day. I'm worried this could get expensive. It is an 2008 268a with 300,000 miles. The filter was last cleaned at about 180000 miles.