Thanks for your input so far; my Mog has a loud exhaust which drones and being an old fart I find it tiring when driving; so I am considering a quieter system to make the car more enjoyable to use, and it has been suggested by the exhaust fabricator I could remove the cat.
So I assume a quieter system could use a few Hp, but this could be balanced out by removing the cat? But then again I dont think I would notice the performance difference, so it could be totally irrelevant.
