A couple of questions about injectors
 

Forgive my ignorance, but how can I test some used injectors, and where can I get them cleaned and flow-tested? How much should I expect it to cost?

I searched for this, but with the keywords that describe my question I got exactly 562,467,231,634 million responses.

RC will test and clean the injectors but they are not inexpensive. I had good luck and fast turnaround a few years ago using a local diesel injector shop. Same day turnaround and cheaper than RC. YMMV

witch hunter or injector rehab man expect about 20 bucks apeice i believe.

deatschwerks can also do it... they're a sponsor and have some coupons for members.

i think for mt.net members injector rehab is like 13 or 14 a piece.....I've actually been to IR and keith(owner) is a cool guy and always helped me out