i found no decent information on there site there is a greddy tic 10157910 piece number, an a greddy tic turbo 10157913, i foun no information of pipping and différence between, is the turbo tic 80mm ? the tic 70mm?

 

70mm only on s2k's

 

but why two piece number, what the différence? wich is better

 

Single exit and dual exit. Check greddy website and put part number.