Hello Gang, Ive been lurking in and around the forums searching out tidbits of valuable information. So knowing that this is going to be quite long. So this is what I have a 2019 GMC 3500HD, so been looking @ Cold air intake, Derringer with IDASH and an exhaust system. So armed with that information did my best research on the various cold air intake systems first. The problem is Banks bases their system on a 2004 Dodge with a 5.9 Cummins so no way to see what a NEW current truck stock system does. Now some of their competitors use partial metal open air filter housing. So after looking at all of the systems a few are visually close to one another and at least a $100 plus dollar spread. Now for exhaust systems once again Banks 4 inch system states a reduction of 57% in backpressure and 80% cooler then stock and 5 inch states 15% reduction in temps over stock and a 85% reduction in backpressure. Sounds GREAT however these numbers are based on a stock exhaust size of 2.85 inch exhaust tip and temp is taken 2 feet behind exhaust tip. The stock exhaust is 4 inch so what kind of snake oil is this?? So on to the Derringer with IDASH I've read all the stats and it would appear that the numbers don't tell the whole truth like 6 power levels really STOCK is one of them so only 5 additional power levels, no information of the levels between stock and 6, no dyno tests to showcase what they can do. While their competitor shows the dyno results of each level and has a built in Pedal Commander that Banks is currently lacking. HP and torque claims are very close as is price. Would really like to go with Banks but with all that's good with their testing I just need something more current to make a informed decision on their products. Like any data can be made to show a difference in manufactures depending on just how you want to make a comparison apples to apples is never one of them. I've read all the reviews online and the ones saying it feels more powerful or faster without any kind of dyno results are purely speculative. Just my opinion, looking for someone to prove me wrong or even provide hard facts to back up their claims.