air flow
Junior User
Joined: Jul 2005
Posts: 73
Likes: 0
well first off I would get a aftermarket y-pipe do a search for ypipe under the v10 forum, I added one to my 2000 excursion 4x4 v10 and gained 1.6 mpg and it sounds alot better. My next suggestion would be a flowmaster 70 series they appear to sound the best on the v10 engine as it has 70 degrees of firing compared to the v8 engines that are 90 degrees. You will probably never get the v8 muscle car sound if that is something you are looking for. But the best gains are seen from the ypipe in my opinion. As far as headers go I have not looked at them much for the v10, however I put some edelbrock on my f150 and it did not make a big difference at all.
Senior User
Joined: Jan 2009
Posts: 419
Likes: 1
Ebay headers are the poo if you ask me. I put a set on my '99 V10 and have enjoyed them since. Idle sounds different and I can feel a little more "seat-o-the-pants" power. Well worth the $125 IMHO. They are copies of JBA cat-4-ward headers, minus the fire -cap -dome(whatever) thingy.
Keep your stock pipe, don't buy a cat back system as you already have mandrel bent 3" aluminized pipe from the factory. A high-flow cat helps a little too.
Sit. Stay.
Joined: Oct 2001
Posts: 18,308
Likes: 20
From: Washington State
This hasn't been proven....yet. 
We're all waiting for Mike aka "Mr. 5-Star Tuning" to dyno his 99 before and after.
https://www.ford-trucks.com/forums/8...-and-cost.html
We're all waiting for Mike aka "Mr. 5-Star Tuning" to dyno his 99 before and after. https://www.ford-trucks.com/forums/8...-and-cost.html
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