i should have asked this before i purchased my flanges and piping but i was greedy and bought them anyway. is the stock manifold flange (the flange that connects to the downpipe) 2.5" or is it smaller? i bought 2.5" 3bolt flanges and 2.5" piping and hopefully that will fit otherwise im out a good wad of cash. thanks...

 

I thought they were 2.25??
(dont take my word for it, i measured and got 2.25)

 

Sober is correct...2.25 is the answer

 

will i have problems or will this still match up?

 

2.5" is when both pipes are together. I doubt those flanges will fit.