it's something minor, but RC usually does 740cc injectors, not 720cc. Also, RC does not sell new injectors, they take used injectors, and rebore them to a new size. How do you know that the turbos spool at 2500 if the engine is being built right now? I don't mean to be rude or anything, just trying to play devil's advocate, don't want your buddy to get screwed. Also, you will want to make sure that the engine runs well after the engine build, often times it won't after upgrades like that. It could mean a lot of work for your friend to get it running smooth.