is nitrous the same as a turbo charged setup, the less back pressure the better or no? i wouldnt think so but on the zex site i saw their hatch with the stock z6 motor and stock exhaust besides a muffler ran a 13.5 with a 75 shot , but they eliminated the cat and used a test pipe so why would they do that?

 

with nitrous the bigger the exhaust the better, becaouse it expands so much in the combustion chamber.

 

so removing the cat would be a slight power gain ?