Here's what I have. Whipple SC, electric fans, full length headers, Corsa dual exhaust, and I just eliminated the cats. BTW, the SC LOVES it with no cats. A noticable difference.

But here is my prob. I want more HP. Does anyone have any suggestions short of a new motor or nitrous that will add more power?...Thanks guys

 

get you some custom tunes.

 

Bigger crank pulley for the blower with a new tune to adjust.


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I have a 03 4.2l f150 stx and I love the truck I just have to have more power do u guys have any pointers for me

 

sell it and get a V8

 

fixed

 

A few years ago the Whipple guys were upgrading to a 10 psi setup that included a pulley, 39lb injectors, and a larger MAF. They were getting 400+ rwhp. Do a search on Whipple superchargers.

 

Thats the kit I have.

 

port the blower? increse boost is a sure way to get some ponys

 

You mentioned having a Whipple supercharger which is 8 psi stock. You didn't say you upgraded the pulley, injectors and MAF.

 

Your right. My mistake. I think the psi set at 10. Somebody told me to get a larger throttle body. What brand and size?...Thanks

 

Here is one thread about the upgrade. You might want to PM a few of the members on it for additional details.

https://www.f150online.com/forums/su...grade-kit.html