In 2014, Justin's crew did a "bullet proof" on our 2004 6.0. They remanufactured our injectors to a larger size, installed arp head studs, head gaskets, new ported(in house) intake, egr delete, new oil cooler, and lastly the x4 tuner. The day we got the truck back, I put it in performance tune. That truck has now been sold to someone drives it very hard on top of being driven daily and towing weekly by us since mid 2014. Needless to say, it's still truckin. These guys are professionals and know exactly what they are doing. I couldn't recommend them more.