The cat is probably holding out some horses but those numbers are inline with a local Mustang dyno we have here. It just reads low. Although I feel it should have made a little more. If its starting to fall past 6700, that means its likely choking or leaking somewhere. With a healthy streetport, it should be pulling past 7k. It could be other things like ignition as well.

thewird

 

doesn't matter what cat it is nor does banzai make their cats, even the most free flowing met-substrate cats will still drop your peak horsepower figures by about 15% and choke the car up top.

 

well pulled little more boost today after the catback but could just be cooler. I still checking boost leaks and making sure all is good ! then calling it a day. thanks for yalls help!