ok, so i wanna order a magna flow high flow cat, but what size in/out do i need, i know current is 2.25 for each Y, but what does the Y go into, a 2.5? and i wanna get the magna flow cat back system also, and it's a 2.5 inch pipe. im just not sure if i need a 3 in/out or a 2.5 in/out cat. i have 96 3.8.