Audiophobe, sorry it was not meant to come across as a

. The headers are brand new, in fact not even made yet, how could we have numbers

at this point? For now best guess is using the numbers from a similar engine in the eclipse. Now these pulleys, esp the unorthodox, however have been around for a some time.
I guess what I'm saying is that I would like to see our suppliers, developers, and manufacturers take a little more responsibilty for the products they are selling us

I'll will be trying to get Vision to supply us with dyno numbers for their new headers. I think its only proper from the development side of supplying quality parts.

Maybe I've just spent to much time in development and an expecting tooo much of other developers??
Ok, SUTHNR that's great

but is there any similar numbers on the 3SX pulley which is not an "underdrive pulley" ?? Maybe on a non-turbo besides.