When shopping for the best aftermarket performance exhaust system for your car or truck, one of the biggest question you’ll have to answer right up front, is whether to go with an axle-back or a cat-back system.

As those names imply, it refers to new exhaust components replacing the exhaust system section starting either immediately after the catalytic converter or further downstream just before it hits the muffler(s).

While that’s probably pretty obvious to most gearheads, you may not know about some of the benefits (and potential drawbacks) of either setup. So we’re glad the import performance experts over at Stillen made this quick video that’ll go over some key factors of an exhaust system that you should consider before clicking the “buy now” button.

Nissan faithful are probably well aware of the Stillen name—a portmanteau of Steve Millen, a professional racer who notably piloted a Nissan 300ZX to an IMSA GTS championship back in the 1990s. The company got its start decades ago making serious performance upgrades for Nissans, but over the years, Stillen has expanded its scope and now makes a healthy mix of performance parts for a host of other import and domestic brands too.

If you’ve been eyeing an exhaust upgrade lately, this one’s a good video to watch, as it can add some clarity to your decision. And it’s under two minutes long, so give it a quick look below.