what's the different between 4-1 & 4-2-1 extractor?..my neo use the 4-1 extractor..it's kinda weak at the low end torque..
not from my understanding.. maybe the thread below can give some helpsI'm confused. I thought 4-1 was for low end and 4-2-1 was for mid to high? Since there's more backpressure with 4-1?