I recently had a set a set of the new LGM Production Longtube headers installed
Also decided to have a few other components installed besides headers- ported tb and underdrive pulley (which often show very little on the dyno) and the LS1edit tuning. Results....
389.2 RWHP, 372 RWTQ
Comparison to the stock w/ intake baseline...
I am very pleased, huge SOTP gain.
Here are the vids. There is no resonance at cruise but it screams at WOT. Enjoy!
On the dyno
75% throttle through gears
Full throttle
Idle/ Rev



Also decided to have a few other components installed besides headers- ported tb and underdrive pulley (which often show very little on the dyno) and the LS1edit tuning. Results....
389.2 RWHP, 372 RWTQ

Comparison to the stock w/ intake baseline...

I am very pleased, huge SOTP gain.
Here are the vids. There is no resonance at cruise but it screams at WOT. Enjoy!
On the dyno
75% throttle through gears
Full throttle
Idle/ Rev