before i get bombarded with remarks i bought the car like this.ok.so i had the car for over a year with a ssca turbomanifold(b18a1) and i never had a problem with it, i read some threads about ssca being cheap and crap and i even saw the same manifold that i have all broke,so before this happens to me i was thinking of swithching to a cast iron manifold,does a anybody know a good manifold for a t3/t4 with a 3inch enter diameter

 

If it ain't broke, don't fix it. lol A full year out of one of those is pretty impressive.
Inline Pro, Blox, and rev-hard all make good cast manifold that would work for you. However, your will more then likely have to modify your down pipe.