Thats not entirely true. I run OS Speed engines and so does a buddy of mine except he has 1 thats modded and his will go for 1-2 mins longer than mine, same truck, same fuel, same plug, same EB mods head button, same smart diffs. The only difference is his is modded. Over all power is pretty much the same. That was enough for me I replaced the p/s/r and bearings and sent one of mine off to be modded.