I'm a bit of a noob on this downpipe/cat issue, so I'll ask:
Is the order suppose to be Downpipe -> Cat -> Muffler/Exhaust ?
So than I would need to expand the downpipe opening to 3" and use a 3" cat to get the benefits of a 3" to 2.5" exhaust for stage 2 (no plans to install stage 2, just want to do modifications that doesn't affect warranty) [
]?