CM 870 ISX

[Chamberpains]

Make an appointment with Mr Hagg in Georgia. Grab a load and head that way if you don't want to deal with it yourself. But if I were you I'd go the way RyanC and Rawze are saying. Get hands on, buy the tools and understand that big ol w9 you got. Its by far one of the easiest to get into and get your head and hands on any problems you have.
With the turbo on your engine, it can compensate for a lot of little CAC leaks. But with the compensation comes a more restricted exhaust and higher EGT's. You need to be sure you have a leak free charged air system. Pressurize the whole engine and then get your soapy water out.