You need to disconnect both ends of the pipe. The intake side may look impossible at first but it's not. It's attached with two 10mm(?) bolts, the front one is accessible from the top but the rear one is easier to get from below. The obstruction may actually be in the intake near the end of the pipe rather than in the pipe. You need to just clean it out as best you can. A drill bit can help to bring out the debris. It's not the end of the world if a little falls in. There is a new style pipe that is less prone to getting clogged, a little over a hundred dollars I believe, but the intake pipes have to come off to get the old one out and the new one in.