Nothing is perfect, you are bound to get a bad one every now and then. However, we have years of trouble free use on Magnecores for some and we have years of repetitive replacement for stock, FMS, and similar wires.

For my next wire change it is a no-brainer to me.

Former owner of '99 CSVT - Silver #222/2760 356/334 wHP/TQ at 10psi on pump gas! See My Mods '05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red '06 Mazda5 Touring, 5spd,MTX, Black