How bad will magnaflow cats hurt my numbers.....
 

I am going to another Dyno Day on the 29th.....I am making extremly high numbers for my setup as of now but need to make changes....one of them is to put cats on the car.....I have a brand new set of magnaflow cats....if I put them on the car what do you all think the drop of RWH and RWT will be?

Eric

It really depends on how much power you are making. The more air pulled into the engine and then the more you send through the cats the more restriction they will be. I've heard of HC LS1's losing 15+ rwhp with a set of HF Cats. I'm awaiting the same results with my setup. I made the numbers in sig with a Hooker ORY which I recently replaced with a QTP Catted Y. BTW The Maggie @ Carsound cats flow around 400cfm compared to stock cats of 220cfm.