- Live in an emissions restrictive state
- Want to keep your exhaust volume quiet
- Do not want excess fuel smell
- Do not want to risk getting a ticket
- Do not live in an emissions restrictive state
- Want a loud exhaust
- Do not mind excess fuel smell
- Are not worried about getting a ticket
- Looking for maximum power gains
Choosing the right downpipe can be a little tricky and it’s best to examine all your choices before making a decision. Exhaust diameter plays a huge in role in how your Mustang will make power, so you will have to take your current horsepower and end goal into consideration. A downpipe with a diameter that is too narrow can act as a huge choke point and will restrict flow on a highly modified car. A mostly stock or lightly modified Mustang can suffer reduced power output from a downpipe that is too large. A downpipe that is oversized on a car can reduce exhaust gas velocity, scavenging, and increase turbo spool times.
Another factor when considering a downpipe is if you’d like to tune your Mustang or not. Off-road downpipes will require tuning in order to prevent check engine lights or poor performance. Vehicles with catted downpipes can also benefit from tuning that optimizes engine and computer performance for the catted downpipe; however, tuning is not required with most catted downpipes.
When and Why Should I Upgrade My Downpipe?
Downpipes should be one of the first power mods that an enthusiast does to their Mustang. They offer a very high horsepower to dollar spent, especially when combined with a tune. Off-road downpipes will generally pick up 20 rear wheel horsepower and torque before custom tuning, with more gains to come once the calibration has been optimized. Catted downpipes will pick up similar numbers but expect them to be slightly lower due to the catalyst restricting exhaust flow