I have a similar story to Chad about Jeff.
My CA18 has been making 217rwkw with standard internals for 2.5 years and considering it made 83rwkw when i bought it you can see that it's making over 250% more power than factory. And it only ever get flogged when it get driven.
He had an issue with a member off he but non of you got the other side of the story. I spoke to him for 30 minutes about the issue and he has a side to that story.
Jeff will not tune cars to the edge unless you ask, so if you take your cars else where then they will make more power but with standard internals (in 99% of cases) you will have to ask at what cost.
And for all you guys +1'ing Boostworx i have some very interesting stories about them which i have first hand proof of, but you won't hear it on this forum.