I have 2 ecus from two different 95 SE 5 speeds. They both work in my car, but they both have different lettering on them. Is there an ecu that has certain letteres on it that is best for Re-programing? Let be know what the best ecu is. P.S. I sent one of them to TS to get it chipped and it ended not working with my car. The CEL was on the idle was at 1.5K rpm and it kept moving up and down. I sent it back twice, until I decided to get a refund. Pretty weird stuff.