Eighteen feet of little bitty pipe with a lot of bends = a lot of back pressure.
I would re route it so you only have about 2 - 3 feet of exhaust pipe.
If you are really good, you could use bigger pipe.
I did.
Mike in Colorado
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2004 Fleetwood Pace Arrow 37c, 8.1 gasser, (Jezebel) Ultra RV ECM / TCM, plugs wires, and rear track bar, PPE deep Tx pan w/ temp gage, Bilstein's, Sailun's & Sumo's all round, pushed by a 2002 Grand Caravan, on a Master Tow Dolly OR a WR-250 on a rail.
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