new truck
 

Well guys I recently bought 2005 4door long bed cummins and I don't think it is stock but they swear it is how do I tell if its not

If you floor it in park and it blows black smoke at first it's not stock! It will stick at max rpm's for a bit that's normal!

It does blow a little smoke it is the 6 spd HO and it has cat and muffler still it does not sound
Stock either

If you can take some pictures of the truck and under hte hood and such, might be able to see whats what?

Your just not used to the cummins power lol

take the engine out and get it blue printed

dyno?

does it have the factory intake, exhaust, intake horn, turbo?