Do these magazines inflate their HP and torque

I think they do. Even some motor builders will. NOT ALL just some. Like redline saying they take a stock LS1 crate motor and change the cam, tune, and put headers on it and bang! Some how it makes 500 HP? Ya ok. lol

Or like one mag that did a 340 build ad it made 390 hp. Then in the next issue they had a frature car with about the same build that had a little more cam and some port work that did 390 HP? HMMMM.

Some of it could be different dynos for sure. I have known guys that took there cars to a few different dynos and non of them were all that close to the same.