If you mean that when your truck doesnt keep pulling as hard when its in the high upper rpm's dont be afraid anything is messing up with it, Ive read alot on here that the titans fall on there face when the rpms are way up there and it doesnt pull as hard.bigkato said:I have an 04 xe titan with air box mod and stock 3" exhaust with flowmaster original 40 installed. I have 89000 miles on it and sometimes when I romp on it when I get to the higher rpm's it fights me a little like 4000 or so and up. Was wondering if anyone else has experienced this at all with their trucks. Thanks for any input. I have definitely learned alot from you guys about my truck and this site is pretty cool.