Ken, I will eventually (not too soon) get 4.10 gears, shorty headers, and some high flow cats. Can you tune for all of these without the truck running lean?

 

joseph- i checked the cats on my 03 5.4- i used o2 bung after the 2nd cat- on each side i measured less than 2psi at 5300 rpms- if ya got 2-3 rwhp with the high flow cats- i'd be surpised

 

Yes, we can handle that and get the A/F right. Its not a major modification and doesn't require dyno pulls for the A/F.

 

Thanx man!

Openclasspro: Explain a bit more about what you just said. I'm not too mechanically inclined.

 

in the 2nd 02 sensor- i installed a psi gauge and measured the back pressure of each side of cats- while driving in 2nd gear at 5300 rpms - back pressure was around 1 1/2 psi- which is next to nothing-phil

 

Ahhh, I see. Well, I'm the kinda guy (at least for now) who lives by the saying, "Every little bit helps." If I wasn't planning on totally tricking out my truck, I would probably steer clear of modding it. Besides, that's pretty cheap hp.