You wont get any gains from this unless your stock cats actually are clogged. The magnaflow cats are designed just like the stock ones they replace, except for the big ugly round GM ones from the 80s and 90s. They are all pretty much "universal" replacements as long as they fit in the area needed and have close to the right inlet and outlet size. The more catalyst inside the converter, the better it can do its job. These same converters used to be called Carsound converters, but they were bought out by magnaflow. Also, btw, if you arent running boost, you will never feel the difference between compression and mandrel bends.
RIP '94 Amber Fire Pearl Metallic Thunderbird on Bullitts [email protected]
96 Sport '02 Explorer PI with ported heads, 90MM LMAF, DirtyDog Marauder TC, Lasota tune, Jmod, Magnaflow mid-mount with X, no cats. Urethane drivers motor mount. HIDs!