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Agreed! By today's standards I'd be looking for 100hp per liter which in my case would translate into 750hp. But that is not what I am looking for. The name of this game is gains in mpg and torque.

Brian thank you for your post, and explaining what I needed to know. My concern with the intake is that while the air box draws air from the outside it sits a top of the radiator. Look at the link on my first post for pictures of the intake system. Ed, K&N does make a filter for my van. It is a...

Gruntguru, My van does use a MAP sensor that is easily accessed. You stared "If the car has a MAP sensor simply compare the reading at key-on-engine-off." But you didn't say what to compare to. Could you please clarify. Thank You

You guys have been great with your comments and suggestions, which I plan on following up. But we have not really touched my original question about exhaust pipe sizing. As of this moment it looks like the only headers available, for my van, are the Doug Thorley Try Y headers here are the specs...

Looking at the air intake of my 1996 Ford E350 (7.5L) van it looks less than ideal. The smallish air box sits atop of the radiator, the air intake scoop also looks too small. I was thinking of a more conventional air box placed in the space normally occupied by the second battery in diesel...

Tmoose - thanks for that info that will save me from crawling under van and looking for the tag on the diff. Gruntguru- thank you for your comments. I agree that some of these upgrades, such as the aluminum radiator, will not help gas mileage.

I will try to answer all your questions: Current gas mileage - The van is new to me so I can speak from experience but what I have read is 8 mpg - 12 mpg. If I can get the intown mileage up into the double digits that would be a success. Transmission - As far as I can tell it is a 4R70W. Gear...

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...