Originally Posted by Equilibrium Tuning
Looks like a bit more boost with your header up top is causing the increase in power. With the Perrin test, it looks like there was a boost leak or a pre-turbo exhaust leak... notice the torque peak is well after 4k RPM. This could also explain the lower boost levels up top.
BTW, I'm not saying your product is not good, but we all have to be very careful about how we run tests like this to make sure they're fair. I don't want this to turn into another Garage Tuning fiasco
I wouldn't bet on that. Look at the 41-4700 range, it makes more boost as well but a little less power. The spool looks about right for the perrin header, and the boost curve looks pretty smooth for having a pre-turbo exhaust/boost leak. The power gain up top is also pretty substantial, I doubt the 1/2psi more boost is making the power gain, look at the gain past 6200 were the boost is virtually the same.
My opinion would be that Chris built himself a good working header.
I wouldn't mind swapping out my Tomie and trying the KillerB out on my XT