i bought a whole 99-00 si exhaust for 40 bucks off my friend. i have a 00 ex . are the pipping the same exact size? i cant really tell a diff besides the muffler. has anyone done this.

 

I think the Si might be a bit bigger. I shold have checked. I just took my whole stock system out for a complete 2.5" mandrel bent one.
But like I said, I THINK it's bigger than the EX

 

i just took the whole stock ex exhaust off. coming to find that i can take the cat apart since its welded to the mid section . so all i can use is the si muffler portion and i gotta rebolt everything else. what a waste. thanks for the comment IslandSi