slotted can be machined.but, alot of places wont.
can damage the teeth if cut too deep, if cut shallow, can take too long and they dont get their monies worth/profit.
I initially went 1000s because years ago when I got them, I wanted pkug n pkay, and they were much cheaper then 2000s.also, e85 was no where near readily available.
will be getting some next stage though.
hmmmmm.dont know.
maybe im used to it from run in tune?
could be like stock turbo cars that dont feel quick even though they are?
will see how she goes at the 1/4.