Put on an SLP pipe/can 2 weeks ago and there was no resistor with it. I called SLP and they told me I was good down to sea level. Mine ran kinda funky the first 30 mins from about 3000'. An hour later at 5000+ it was ripping and has ever since. I did have some thread issues in the SLP EGT bung. Make sure you look it over first because its a wierd thread pitch (12mm x 1.25 pitch?) if I remember right and I had to order a bottoming tap to clean it out. Make sure you use anti sieze, the OEM EGT plug is stainless. I would also get a new Y-Pipe to head gasket just incase you tear the stock one or just to have everything new.
Read the directions on re-routing the wires to the left side of the plenum and you should be fine. Good luck. EW