Im just wondering what kind of boost and egts i will see with a boost elbow, xzt+, rv275 and dual 6" stacks on a straight 4" exhaust, also can anyone point me to an oil free air filter that will fit in my S&B cold air box?

 

Well your boost will be able to go to whatever you set it at. I wouldn't recommend going over 30 lbs with the stock HX35 in my opinion. I can't help you much with EGT's however because I don't know what the RV275 Injectors run like. You'll notice higher EGT's because of them and the XZT+, but bumping up the boost a bit with the boost elbow will probably help you keep things fairly cool. Your exhaust won't do much since you already have 4" straight.