Do I need new fasteners or gaskets to install this?

The system uses factory bolt points, but you'll want gaskets at the catalytic converter connection. Grab the right size gasket kit separately—most builders keep those on hand anyway.

Will this fit with a tune or ECU flash?

Catback systems don't trigger any ECU changes since the catalytic converter stays stock. Any tune is independent of exhaust fitment, so you're good either way.

What's the return process if it doesn't fit?

Test-fit before bolting everything down permanently. If there's a genuine fitment issue, contact support with photos and we'll work it out. Unopened, uninstalled parts return within the standard window.