Pat, have you played with the step headers much? I know the results of the equal length, played the dyno game myself.... I'm not talking street use only, and where I intend on going that 10 horse could be crucial. The only thing we don't have dyno data on is the distance from the header flange to the step... The merge collectors when paired up properly do one heck of a job on scavenging cylinders and ensuring the incoming charge doesn't have to contend with any leftovers from the previous burn. It's just more then anything going to be a dyno game for bragging rights at the coffee shop!!!! Then, I'm going to sell the car and get back on the Ranchero.... Don't ask why, I'm at a total loss for a good reason, just something I've been wanting to play with....