When my OEM Cats failed, I was shocked at the $$$ tags on the Cats. I ordered some replacement Cats from on of the big name after market muffler manf that has direct OEM replacements parts, (sorry I forgot the name), and my local Middas Shop gave this company high praises on their replacement Cats.
So when the day came to replace the so called direct replacement Cats, it was a nightmare. No way would these direct replacement Cat's be installed without heavy modifications to the exhaust and maybe some cross member mods. So we put the project on hold.
I was reviewing Cat replacement options and ended up on the Mustang page similar to our SS/R page and everyone was talking about the Pypes systems. So I call Pypes and ended up with a sales clerk who owns a Trailblazzer SS and he just completed an exhaust mod with long tube headers on his TBSS and advised me that the Pypes Cats would fit.
He offered me three choices, OEM standard flow Cat, Hi Flo Cat, and a Racing Cat. The clerk installed the Hi Flo Cat in his TBSS and was very pleased with them, so I went with the Hi Flo Cat. When the Cat's arrived I was very impressed with the quality as well as the size.
The Middas shop was also impressed with the quality of the Cat. Install was a breeze with no mods needed for install. Once the R was started, I could tell it had a different rumble to it. (I have Magniflo one in two out system installed from the Cat's back.)
When I left the shop to head home after the install I noticed a totally different response to the acceleration as well as a much healthier rumble from the exhaust.
So if you are needing Cat replacements, by all means look into the Pypes program.
T