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Message: [QUOTE="TyCorr, post: 1111644, member: 1451"] There is no injector size threshold. If you drive in a manner that builds boost at around 40psi or more you had better be getting studs and spring and pushrods of the upgraded variety in there. If you run a stock turbo on a high mileage motor with any upgraded injector and drive hard you should have springs as the stockers are pretty borderline insufficient in my opinion (who am I though lol). Here is my take, if you wanna drive on the street and impress people who.dont know anything you can do that with a stg1 or stg2 and if its only occasionally whooped on a 38r and 160/30-80 is fine. You start getting into higher fuel and its imperative. My 175/80s were tuned wimpily by choice so they would only emit a puff of smoke at wot with a 38r. I had some hot tuning that would smoke, belch soot, etc and the boost would go over 40psi readily. It really is dependent on the driver. If you are aggressive then you need to do the head mods if you think about adding any larger injectors. In my opinion, of course. I know people.will tell you "I ran 238/100s on my stock fr motor for 45k miles with nothing else but tuning." I suppose if you just daily drove it and used the increased power for passing on 2lane roads, you would indeed be fine. As you arent doing MUCH outside of what you can do with a stock truck that is tuned. I had a buddy with 238/80s and a bts. No support mods. He started getting smoke and then it was running rough until warmed up. He finally lost two pistons. Tore it down and as suspected there were holes in two of the pistons. But what he wasnt expecting was the obvious marks where the valves were being smacked by the piston. It isnt what killed the motor but it was definitely at work on the cause. He drove it in a street tune and a heavy tow tune for the record. Im not sure how much he drives. We put the stuff in one fall before harvest and he ran the truck for the harvest that year and as a dd for the whole next season. Shortly before harvest, it went down. Id guesstimate 35k miles per year. [/QUOTE]