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Join Date: Aug 2007
Location: Manor, TX
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I haven't had to do my OBS yet, but it should be similar to the SD. International has a updated version of the pipes for the SD that would fit if you want to change the turbo and exhaust manifold. Sinister diesel has a custom version that is bellowed like the new international version but fits the OBS but it's expensive. If you have another vehicle to drive, pull the pipes off and check them, you may get by with just replacing the doughnuts.
As for pulling them off, they strattle the transmission. You can either pull the transmission and remove the pipes in one piece or unbolt the pipes at the Y behind the turbo and remove each half separately.
After having done the pipes with the transmission in place, I would say pull the trans if you have the tools. It is not a job that I want to ever do again and I was sore for several days afterward. That being said, I am glad I spent the extra money for ceramic coated bellowed up pipes that I should never have to touch again.
If your pipes are leaking, you will regain some boost by fixing the leak.