You don't need to modify the internals of your engine to accomodate an intercooler. An intercooler does not add any undue stress to your engine.

An intercooler is basically a heat exchanger (radiator) for the air that's coming in. It has no moving parts other than the fan underneath it making it pretty reliable.

Most changes will involve the intake plumbing. Madali lang naman iyon as long as you have the right parts.

You may want to get a double-wall (4D56 TDIC) or a scooped (4M40 TDIC) hood to help the intercooler breathe better.

Horsepower will go from around 84 bhp to 99 bhp.

Try to join the off-road trips. There you will learn that its not always horsepower that counts. I learned that a lot the last time I was with them.