modifications to 99 F250!
New User
Joined: Jul 2002
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From: Garfield Heights USA
modifications to 99 F250!
What are some modifications starting from the cheapest for horsepower on a 1999 F250 with a 5.4L with 3.73 gearing. 
I was thinking an exhaust with a possible replacement cat, pulleys, chip, and etc.
I was thinking an exhaust with a possible replacement cat, pulleys, chip, and etc. 
Senior User
Joined: Jul 2002
Posts: 279
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modifications to 99 F250!
Two chamber Flowmaster Cat-Back exhaust system & a K&N air filter will make a differance you can feel, and hear!
I am guessing 20HP.
And then like 'Mustang' said in my post, electric fans and MSD ignition will give ya another 20-25HP.
Theres a good 40HP! You'll feel that!
'LIGHTNING' said you can advance the timing and run higher octane fuel. but I cant afford higher octane fuel, so I haven't done that yet.
All of the above was posted for my 5.8L 351, it's a little differant than your 5.4L T, but all will work the same!
I am guessing 20HP.
And then like 'Mustang' said in my post, electric fans and MSD ignition will give ya another 20-25HP.
Theres a good 40HP! You'll feel that!
'LIGHTNING' said you can advance the timing and run higher octane fuel. but I cant afford higher octane fuel, so I haven't done that yet.
All of the above was posted for my 5.8L 351, it's a little differant than your 5.4L T, but all will work the same!
New User
Joined: Jul 2002
Posts: 9
Likes: 0
From: Garfield Heights USA
modifications to 99 F250!
Thanks for the info!
Do you have any idea where I can find that exhaust system, and about how much are we talking here? Exhaust was definately first on the list.
Will changing the ignition mess up the computer?
Do you have any idea where I can find that exhaust system, and about how much are we talking here? Exhaust was definately first on the list. Will changing the ignition mess up the computer? 
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