Quote Originally Posted by matt5112 View Post
no wonder my car has less boost (see better flow) with the SD headers compared to the pacecrappers...
That makes no sense if the primaries are smaller on the SD's than the PS's. 1 5/8" is smaller than 1 7/8"...1 7/8" is almost two inches...which means it should should flow more than SD's...unless SD's are the same as PS's.