I wonder there are DIY for install Greddy turbo kit.

How much is it going to cost if I let mechanic to do it?

 

Yes. Its called the "instruction manual". Its actually quite good.
If the manual is not sufficient, you should consider having a professional do it.
Expect to pay $600 - $1100 for the labor and $300+ for tuning.

 

 

I believe there is a DDIY...

 

DDIY? [Don't Do It Yourself} lol.

The search function for this site is ruined.
Use Google.

 

So anybody here installed turbo kit by himself?

I wonder how hard that is....and How long it is going to take install..

Paying 1100 dollars for labor fee is too much....

 

most of the install is a joke, but it does take up time. it consists of cutting up a bit of the undertray and connecting pipes together. You just have to pay attention to the directions and the fixes (described on this forum) so that you get a fully functional kit without quirks.

If it's a new kit, you will need a nipple installed on a pipe for the wastegate (fix #2). And you'll also want a bov installed on the charge tube. It's also recommend that you have bung installed on the exhaust system somewhere for wideband sensor. Aside from these three items, the rest is OK to do at home.