one issue is making sure it’s not noticeable either so you don’t get ? On it if emissions notices. Probably never happen, but tampering will fail you if noticed. Still, with a resistor costing maybe 50c, I’m going to solder into the wire. The variable knob sounds nice too. Dial up or down a dozen or two ohms depending on season. Also dirt cheap and easily added to the wire mod. IF you’re good w wires n solder. Putting mine in soon. 100 ohm resistor on deck. It’s easy enough to fiddle if it acts up. But if you’re not good w soldering and wiring, go pre-packaged.