So all I have on my stang is the flowmaster outlaw since then is been backfirering idk y
Do I have to change the xpype or something to improve the airflow ???
Are you talking about the exhaust kind of popping after revving it up? Because that's normal when upgrading from the oem mufflers. Some exhausts just does it more than others.
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
Mustang Evolution Forum
2.1M posts
50.8K members
Since 2003
A forum community dedicated to Ford Mustang owners and enthusiasts. Come join the discussion about performance, horsepower, modifications, troubleshooting, racing, and more!