I knew my primaries injectors needed changing because of excessive backfiring and fuel burning below 4000 rpm's. I got in there to find very new injectors, but installed crappy. No plastic spacer, no rubber grommets, things like that. I put in new injectors and fixed a bunch of leaks and such. Now I get less boost. Could the leaks have caused higher boost and now it just doesn't boost as high? I hope this is the case. Would putting 550cc injectors in the primaries be the problem? I don't think they were since I put them with other TII injectors in my shop, but they could have gotten mixed up with some NA ones. Please help.

 

If you had a vac leak in one of the lines to/from the waste gate actuator valve that would prevent the wastegate from opening, or require more boost to open it, increasing boost.

 

where are you measuring boost from? This counld be why