As you can probaly guess this is not about the furry kind .
I was wanting to Replace my stock muffler on a T6 xc90
With a Cat-back system and I was wondering if I should
Also remove the Cat at the same time .
My thinking was that the turbos don't like the back pressure
Anyway so I would pick up some fuel saveings by removing
The back pressure from the cat .

 

Replace cat with a high flow cat. Seriously, modern cats aren't a restriction unless they are blocked. I know the internetz say they are, but they're not.
Cat back will make a difference if it's done right.

 

66 people viewed this expecting a "How To" on removing cats, me included...

 

So I guess replacing the stock Cat. With a hi-flow Cat. Is the best way to go.
Ok thanks .