Slow lopey idle?
 

Saw this FD from a guy named "Clayspec" and im curious as to what causes the slow lope sound different than the typical brap from bridgeport. Any ideas what kind of porting is done? :scratch:

Heres a vid

https://www.youtube.com/watch?v=TO5vuk6zAkE&t=50s @ 1:35

That was just engine surging. Any poorly tuned rotary will do that, so probably on a Power FC instead of stock ECU.

As far as I know ClaySpec FD is stock motor/turbos. I think he just picked up a Fleabay knock off CX racing single turbo kit because his stock turbos are going out.