Last year I bought a new msd billet, 6months after I installed it I added a 3g, 130amp, the msd went ape sh!t, we thought it was the alt at first cause it was the so called NEW part but we threw in a stock dizzy, ....ran perfect. Took the msd back to Summit and got a full refund cause I bought it new outta the box. If you ever do a 3g look out for this symptom. It breaks up around 2000rpm and worse with accessories on.