I justgot reading an article about this guythat has a twin turbo but he modifyhis tobe non-sequential. how is that done and is it worth it? what are the pros and cons. Any link that explainhow to do it? I fhtis wirk then insted of getting the XS single kit I just do this.

 

I htink there is a thread about this that is still on the first page. Try searching.

 

If you do the FULL NON-SEQ conversion, it will yield a little better flow and a little extra hp, but not that much (it won't compete with a large single turbo). Here is the conversion:

http://www.scuderiaciriani.com/rx7/non-sequential.html

There is still the efficiency range of the stock twins. Even running in non-seq you'll still be limited by that so it really depends on the goals for your car. If you need to be over 400rwhp, it will be done easier with a single turbo kit.

It all depends on what your goals are for the car, and how much money you want to spend to get to that goal.