I have a 1996 Ford E350 with a MFI 7.5L V8. This monster is renown as a gas guzzler and I am researching ways of improving gas mileage while making it more efficient and getting more power. One of the things I am considering is installing headers and a new exhaust system. My question: Is a Y pipe feeding into a single exhaust pipe just as efficient as running duals with an X pipe? Because of the undercarriage packaging the exhaust pipe(s) have to run on the passenger side. The large gas tank sits on the driver side inside the chassis rails. SO there are some packaging constraints.
What size tubing should I use if I use the Y pipe single exhaust pipe?
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