Ya get it at Radio Shack. Do a board search and ya can get the number and procedure to install.

 

Oh man dont put a damn resistor in there. Im about 100% sure you wont benefit from an LT4 KM with your mods. And loud exhaust isnt going to cause any false knock that wasnt already there. My valvetrain is pretty noisy compared to stock and I dont really pull any knock retard with the LT4 KM.. probably wouldnt with the LT1 either but I dont have one sitting around to test. The LT4 is just like the LT1 but less sensative is all.