Is it worth getting the efini twins? Whats the max amount of boost u can get from these?

 

The efini twins has it's pro and cons. Try "searching".

 

They can get a couple more pounds than the regular stockers. As to deciding the 'max' boost, it's impossible to pinpoint a number - more boost = less efficiency, shorter life, and more heat. It all depends on your goals.

Now that said, it's kinda stupid to spend extra $$ on 99 spec turbos if you intend to push their boost up high. You would be much better off spending on a setup that's really designed for higher boost, like BNRs or a single.