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Message: [QUOTE="KCTurbos, post: 1534524, member: 13852"] First off... I don't want this to turn into a t4 vs drop in pissing contest (which is what always seems to happen). But I will say that our drop in turbos have changed DRAMATICALLY over the last few years and improved greatly. I will also say that I can't tell you how many hours I spend each day helping people fix boost/exhaust leaks that lead to performance issues across all platforms. I literally have hired people to spend their days on the phone/email/pm/text/instagram/forums/etc helping people fix/find boost and exhaust leaks. With that said... with our newest turbo designs... I have never had a truck with major egt issues that did not come down to boost/exhaust leaks or trying to lug the motor in OD going up a hill. I truly believe a lot of guys fix missed boost/exhaust leaks when going t4. Not saying t4 does not work great. But I can't tell you how many turbos I get sent back for "warranty" issues that you can see obvious signs that the up pipe clamps were not lined up right. Also when inspecting trucks in person that have egt issues we quickly find boost/exhaust leaks and the problems go away. So why would t4 guys not struggle with boost/exhaust leaks? Well they do, because I help them fix them all the time. But I would also venture to say that a lot of common leaks gets fixed when you replace every part associated with boost/exhaust system AND the type of person that would be willing to dive into a t4 kit would also be the type of person to find/fix leaks that are present. But back to your original questions. I am not sure on the HP of the tow tunes he had. We did not dyno the tow tunes. They were limited enough that when towing REALLY heavy up a big hill he would sometimes run into issues of holding the pedal all the way to the floor and not being able to maintain a steady speed BUT ALSO couldn't get his egts above 1100-1200 degrees no matter how hard he tried. I told him he just needed to turn the tune up a little bit so he could push the 1200-1300egts and have a little more power. With average loads he always had plenty of power. (he sometimes gross 30k going up 7% grades) Now with the 238/80 he has more power... but can easily fly past 1300 degrees when not even going above 3/4 throttle. He never needs that much power with average loads and never struggles with egts. But when he really gets up their in weight he has to be careful. I think some more live tuning could alleviate either problem with either injector size... but not everyone has access to live tuning or willing to watch gauges as closely as he does. Your issue could be related to not being a true SXE turbo Boost/exhaust leak? Stock injectors not maintaining great ICP? Running too much PW and creating excess heat (PW vs Nozzle size is a balancing act when it comes to optimizing performance) Rpm placement? [/QUOTE]