I have been runnin the 4094avant for almost a year and have a few things to say about it.
First is, I have stock injectors and cp3 and engine, everything else is modified, including 4.11 Yukon gears, lift, 35's, truetrac, intercooler, egr delete, dsp5 and tuning etc etc
The turbo is nothing like stock IMHO. The stock turbo when tuned had almost zero lag, immediate throttle response and instant powerband and fell off on the top end pretty bad. The 4094avant has a noticeable lag as compared to the stocker, but not bad compared to most any other aftermarket turbo out there, it's acceptable, it develops power a little higher in the rpm and builds power very solidly and doesn't really fall off at all, in a passing situation the stock turbo would light, get up and want to go and you could almost feel it fall off or plane out right away, IMHO. Also IMHO, the 4094 in the same scenario would need a half a second or so light and just build gobs and gobs of power almost til red line and be right there again each shift.
I guess you could put it this way, the stock turbo is always ready, but not to do very much almost like it gives up early, it is always ready to dance but stops before the songs over. The 4094 is just a bit lazy or slower to the dance, but will finish the song strong, it just keeps pullin. The 4094 makes the gears feel shorter, lol, cuz it gets the job done faster.
The stock turbo on tuning, I could get some pretty decent smoke goin. The 4094 cleans it up pretty good, but the 3" one piece all season y-bridge helped in that respect too. The 4094 will puff a little signal out the exhaust when your under it and lay on the throttle, and if you force the trans to stay in gear and slowly roll the throttle you can smoke out a nice stretch of road, 2 thing I could never do on the stocker. But, under full throttle and comparing optimum to optimum range, the 4094 runs cleaner. I did notice lower egt with the 4094 but I installed a BD cools it intercooler at the same time.... I bet each one did appx 100* of difference
All in all, I say it's a good turbo, and bang for the buck easy drop in, there isn't a match for it. Is it the best in its size, nope. Is the the easiest and cheapest way to more power, yup, cuz it's drop in and retains a t3 flange. If I could do it again I'd probably get a billet wheel, or possibly look a little bit harder at danville's stg2 vgt 68mm turbo. I might upgrade to the vgt72, but then again, I have been looking into getting a gtx turbo as well. I'm not a dedicated vgt guy.
Oh, something very important to note, the 4094 and a 3" downpipe make a glorious whistle, it sounds so much better than the stock turbo, and the exhaust note is much throatier, it sounds mean and nasty as compared to the stocker
Again, all this is said IMHO, and should be taken with a grain of salt,as I am not an expert on this, or any subject:joker: