Thanks for the replies guys. I love a good debate and I learnt a thing or two from the above posts. I'm going sidefeeds regardless if their design is outdated, many people have run them in the past and made solid power. I have no pans to run e85 so that doesn't come into the decision. But mainly they fit without spending a fortune and time making rails to run top feeds. So the question I really want answering is if I get the s15 injectors (that I already have) cleaned and flow tested can I expect them to be all very similar flows? Or does anyone know where I can buy a set that are already flow matched together? While flow matched injectors isn't something everyone gets done, I firmly believe they solve alot of tuning issues when every cylinder is getting it's fair share