Need help with exhaust setup

[chimchongdlight]

Chim, there will be no high flow cat that will allow you to pass smog. OEM or nothing at all, the smell without one can be fixed with a high flow cat but it won't eliminate the smell.

and yea for the i6, low RPM is massively loud and the noise isn't what a MB is suppose to sound like..

thanks man, yea i didnt think it could be possible, so should i just upgrade all my piping and keep the cat and res stock?