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When I got my truck on the road the parts truck had a good exhaust system all the way to tail pipe so it when on my truck, no cat and EFI manifolds on a 300 six.
A year later the inlet came loose on the round muffler like shown and there was no way to replace it without doing mid and tail pipes.
So I up graded to 94 F150 system with performance Thrush welded muffler. The 94 pipes are larger then the 81's.
With the EFI manifolds, no cat and welded muffler it sounds pretty good for a six.
Cat was not used.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.
