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My friend did it and then wrapped it in K-wool a fabric used in the foundry industry. I will do mine that way too. He said there is plenty of room between Fuel tank and bed of truck. His only problem is the fabric needs replaced every so often. (Between exhaust and tank)
surely somebody looked at eric mcbride (aka stacked n jacked, aka diesel sport promotion) stacks at one point or another. they are plummed under the bed and both work. and he has had them installed for several years like that.
I did have stacks on mine. Running them between the bed and fuel tank required some tricky bending. Mine sorta had some bends that kink up the pipe.
Crawl underneath your truck. Look at the top of the fuel tank. Mine had a droop casted into the fuel tank. It allowed If I remember right about 5 to 6 inches of room to run pipe.
One thing to remember is if for some reason you rolled your truck those hot pipe will possible get shoved into the fuel tank. At this point rolling over will be the least of your problems. Could be a bar b que.
Some day I might run stacks again. My plan is to constuct a 4'' x 4'' square tube. Split it in the center. Punch hole on each end of the square tube for what ever size stack you are gonna run. The square tube could be mounted securely to the top of the truck box. Run some flex pipe from the stock exhaust to the square tube and walla. PIPES. If a guy want's he could find some stainless square tubing and polish it nice and neat so that its not a sore eye to look at in the box of the truck. One other benifit would be easy to take them out and throw on the old exhaust.
Right now I just run dual exhaust. With a pair of 5'' tips about 16 inches long. pointing to the corners of the bumper. Has a really low tone compared to a single piper.
My cousin Greg just put stacks on his 97. He took some 2" x 6" square tubing and laid it flat in the bottom of the bed. It had a flange welded at each end for the four inch to clamp onto and one in the middle that connected to a piece of stainless flex pipe, which he ran to the stock straight undernieph. It looks and works very good and doesn't take up much space in the bed. It might even fit undernieph.