2003 7.3 performance upgrades? - Ford Powerstroke Diesel Forum
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Old 09-25-2010, 09:50 AM
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2003 7.3 performance upgrades?

Hey all. Just bought my first diesel. Its a 2003 f250 crew cab long bed, automatic with 3.73 gears. It is bone stock with 67k one owner miles. I want to add some performance parts such as exhaust, programmer,cold air intake...etc. Any advice would be helpful. 4" or 5" exhaust? Best programmer? The truck will be used mainly as a daily driver with some weekend fifth wheel/car trailer towing. Thank you.
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Old 09-25-2010, 10:13 AM
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Any 4" exhaust system is more than enough, a DIY 6637 intake, and custom tunes from PHP, TW ect... just don't go with a generic tuner.
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Old 09-25-2010, 10:32 AM
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Hey...thanks. any 4" system better than another? Also, I was told that it is better not to run it through a muffler. Also had others say that it would run better with a muffler due to some needed back pressure?
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Old 09-27-2010, 08:59 AM
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There is no truth to the myth of an engine needing some amount of backpressure to produce good torque. It is from the hot rod days when carbuerated motors would lean out (ie not provide enough fuel) when less restrictive exhausts allowed more air into the engine ... and would end up burning hot and burning exhaust valves.

The least restrictive exhaust, the better. You have a turbo in the exhaust path anyways ... so its not like you can eliminate exhaust backpressure entirely.
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Old 09-27-2010, 11:26 AM
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Exhaust systems varrie in price but except for material used and that some use clamps and others use welded hangers not much difference. Mufflers won't affect HP but will affect noise..some like some don't.

Tymar intake..or a DYI done correctly.

Before a chip get guages. We carry Isspro's..match the dash guages nicely.

Ts chip with tunes by TW, Cale, Bean or Bill all great tuners. We have TW and Cales tunes.

Cary
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