ok i am looking at 275's. i did a search and 275's with ez seems to be the best towing combo. i still have a few un-answered questions. i went to citydiesel.com and found the 275's, but i also saw the 60 hp and 80 hp injectors too. whats the difference? should i buy injectors or just the nozzles? i do all my own work to my vehicle and feel confident i could install nozzles if i had directions. my truck is a 99 24v with edge ez stock air box, turbo, and auto tranny with a 4" straight exhaust. i want the best towing combo for my stock turbo and tranny. i have fuel press., post turbo egt, and boost gauges from isspro. with the ez and boost elbow i make 20 psi and no more. i've heard alot of guys boost higher with the elbow and some do not. what injectors do i need to run with my edge ez at those psi levels on stock trubo, and not toast the tranny. i do not race the truck or hardly ever go wot. it is my daily driver and i tow 3k ( 16ft. dual axle with utility vehicle and gear) generally once a week or less. i want to upgrade injectors to have a great towing combo. what should i do?

 

Adding those injectors will make for a great tow package but may be pushing the limits of your stock tranny. Usually the EZ is as far as you safetly want to go without some transmission upgrades.
Towing a 3k lbs. trailer isn't exactly working your truck very hard, I only found it necessary to install bigger injectors after purchasing my 5th wheel (16k lbs).
You may and I say "may" get better fuel economy running the 275's, just remember that your tranny may fall victim to the additional power.