and they said that their shorty headers for my truck (p/n 309) would yield gains of 8-14 hp and 18-24 ft/lbs of torque. I'm still looking at the 310Y, but those are pretty good numbers if true. Anyone have any real proof?

 

I would be hard pressed to believe that from shorties.

Check your PM's.

 

you might see those numbers at the motor. It's kinda funny, the guys at thorley told me to buy the 310Y, and block off the egr...... and i'd see much better gains..... why would you ever buy shorties with the price of that system?

 

Too high for a shorty IMHO.

 

4-7rwhp sounds more rasonable.