just out of interest, i emailed microtech and asked for a quote for an LTX8 for my 20v and the guy assures me that you only need a LT8...
The guy said:
"The 4AGE runs a dissy which means you will have to use an LT8.The LTX is designed for 4 individual coils & has to be run with a crank angle sensor that has a home & reference signal."
However, i have read of many ppl using the LTX8 for a 20valve, what is the go? What does the "x" mean exactly?