I wanted to know what kind of horsepower will i get with itr pistons....also do i really need to change my injectors..I want to drive around for a while until i get 430cc

 

Expect 180s to 190s. Yes you really need more fuel.
And I wouldnt recommend the toyota injectors if they are the 430s you refer to.

 

Do yourself a huge favor and take it from me "Do not get the injectors if they are the Toyotas". I had them in my car until about 2 weeks ago. They are not plug and play. You can get different injectors that are half the hassle at half the price.

My experience with them was less than satisfactory.