whats better out of the 2 and also any one kno a good bov let me kno trying to learn as much as possible thx

 

For a street car a manual controller is a good upgrade from just a waste gate spring.But an electronic controller is worlds better than a mbc , especially on a race car.

 

A lot of EBC don't work well, or at all.

I've seen run of the mill cookie cutter build nine and ten second Honduhs running a two stage MBC.

Going from TurboXS dual stage to AVC-R on a recent CRX, the driver might have picked up a tenth in the quarter. He's also one of the better drivers on the planet, so your mileage may vary.