I just replaced all 16 injectors. 6 of my 8 primaries were shot and 2 of the 8 secondaries were shot. The motor was running so sick I was afraid I had other problems. With the new injectors I have noticed the following:
Motor fires immediately sometimes (but still may take 2-3 cranks other times) which it never did in the 7 years I have owned it. Power is there again which may be slightly more but not a major improvement from when the motor was well. I purchased my injectors direct from R/C in Ca and got then for $68 each which was a slight savings over a seller.
Kurt White states that R/C injectors are simply the best >
http://www.whiteracingproducts.com/inc/sdetail/19664