I installed the Ford Racing Performance Parts full rear exit header exhaust system (P/N M-9430-GTX), which has an EGR port at the end of the passenger side header, an O2 sensor port at each header collector, and final O2 sensors right after the racing mufflers. I have gotton no engine malfunction indications with this system, so I wonder if they may have put some palladium catalyst in the racing mufflers as an alternative to the cats.
Additionally, the removal of the OEM muffler, cat pipes with flanges, and cast iron manifolds and replacement with the M-9430-GTX exhaust system reduces the weight by 70 to 90 pounds. Feels like maybe 25-40 hp gain.
When standing on it, there is no doubt that from the volume that this is a full race exhaust system. Yet, at constant throttle, and mild acceleration, it is not noticable in the enclosed cockpit. I'm very happy with both the tone and the loudness factors.
The system is made for FRPP by Borla in Oxnard, CA, and they sent me the original installation manual as a 8 page PDF file, which shows all the installation photos in color, and they can be blown up full screen as they obviously were taken in high resolution digital form. If anyone would like to have a copy, I'll send it to you. Contact me at
rlehots@aol.com
Ralphie
PS - the tips on its exhaust pipes are also much better looking