hi knowledgeable ones sorry to be a pain was just wondering what would be the best boost pipe thickness to run for a t3.bascially im converting an xr2i to run turbo power and was looking at ordering some 3inch universal boost pipes so i can run a custom mounted intercooler.have been told by friends that it will cause major lag with a standard (as far as i know) T3 so was wondering what would be the best thickness to get,2 inch 2.25 inch or 2.5 inch

many thanks for your help in advance