Hi, i've installed my stillen exhaust yesterday and i felt a lot of changes about my sedan auto trans.
First, the revolution is kind of hard to get over 3000rpm.
Second, it seems like more air is coming out of my exhaust and the smell is different.
1. What is the reason of this changes?
2. What can i do to have the car run normal?
3. Is it because the Air flow is different?
4. If so, do i have to go for TS ECU reflash to fix the problem? Or tune my car in other performance shop?
5. The stillen exhaust sound really nice

With an aftermarket exhaust you may lose a little low end torque. I'm not sure if that's what you are trying to describe.

The smell is probably the chemicals and debris inside the exhaust burning off. This is normal on new exhausts and should disappear after a few days.

You shouldn't have to do any reflashing.

sounds like you're trying to say that it's difficult to get past 3k rpms? if so, that is a problem and you should contact stillen....they should have answers since it's their exhaust system.....if anything, reset ecu.....disconnect battery overnight or pedal method.....that smell is some type of coating that burns off initially, just like when i had my headers and ypipe installed.........that smell goes away in a few days....

i guess ill try the 12 hour ecu reset then see how things go, but should i do some tuning?