$2700 is a total rip off. Pull it out yourself, it will take at least 2days to pull it if you've never done it b4. Here is a link, a total rebuild cost for a 86-88 13b 6port is $521.XX plus tax and shipping ( http://www.rx7club.com/showthread.php?t=395019 ). It would be alittle more money for an s5, about $50 or so. I advise if you do get this buy the rebuild video from Rotaryaviation.com it is better than the atkins video. Rotary engines are 100x easier to rebuild than a Piston motor IMO, it can be done in one day if you don't intend on porting the intake and exhaust which I advise you do. It's an extra 30-40hp over stock but to actually get most of the power you'd need better exhaust (If you don't already have it) and an safc to help the fuel control. I have 2 550cc injectors for sale if you want them, 4-550's are good up to 300hp at max duty cycle (which ofcourse you'd never do), so 2 460's and 2 550's would be plenty for 180-190hp. You'd probably want a TII fuel pump too, I have one for sale along with the 2-550's if you want them.

P.S the injectors I have are high imp. so they would work fine with your s5 engine harness.