2003 lx/si exhaust swap?
 

Hi, not sure if this is the right forum or not. Here goes- I have an 03 civic lx 4dr with the built in cat on the header. Anyways, it needs to be replaced and I was wondering if the si header is compatible. I'm thinking i would probably need the rest of the si exhaust including the needed cat.

Anybody know if this would work? Or how I can avoid paying $1000 to fix the leak?

Thanks