The 40 series Flowmaster went on today...LOVE IT!!! K&N also went on this weekend. The truck has shown excellent response to both parts. Nothing beats seeing the look on peoples faces when you tell them the motor making all that big boy noise is just a six cylinder...lol. But my question is now what? I was thinking between header or 3.73's. Ive heard the header isnt all that worth it, but any advice is welcome. Thanks

 

I would go with a Super Chip

 

I have also heard the headers aren't worth it for our engine...I'd go with the 3:73. I'm getting 4:10 put on mine next month.
But I've heard from PKRWUD that his Jetchip showed a great inprovement.

 

That factory dual tri-y exhaust manifold is excellent. Buying a header would be a waste of money. I HIGHLY recommend a JET ECM chip. I loved mine. What gears do you currently have?

Take care,
-Chris

 

if you have higher gears (3.31 or numerically lower) tehn id go with gears. the chip is also a good choice.