i wanna learn how to madify a cummins and other diesels

There are a lot of things you can do to these trucks. Its crazy how much HP you can get of these and still get great fuel mileage and drive it everyday. Cummins has a 1/3 less rotating parts then a powerstroke or duramax. Working on a cummins is very easy. But watch out... it gets addicting and your other projects might get neglected.

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Mine tows every day, 8K+, runs around town, and get an average of 19.5mpg.
As far as addicting, little gas engines, just seem boring now. The baddest RB truck motor I have seen doesn't hold a tea light candle to the cummins, and burns 3X the fuel.
Take a look at the oil filter, I wrote the mileage on it, look carefully, that isn't 34,5XX, thats 345,***....... Yyyyyeah, do that with a gas engine!

This winter I am taking my "rebuilt too many damn times and failing again" Getrag out, and putting a 13 speed in it. Just to be cool, and to have a gear for everything........