Originally Posted by Steve
Knowing it would leave some HP on the table, but do the stock cats overheat if the stock midpipe is left in place?
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I like where your going with this.
Not so much the heat as it would also be the added pressure from a higher flowing header. Especially if the car is S/C'd....you'll blow it apart! And without a tune after your header swap, you'll 100% throw codes. The midpiping
must be replaced, along with the cats (or none), with a header swap!
ARH is already manufacturing a shorty header for the new Camaro and promise to have the Mustang shorty available early next year. The design meets EPA and will
not require a midpipe setup (or tune i believe) to bolt to the factory system. A cheaper option for folks. But if you get anything other.....
don't try to use the factory piping & cat's.