sounds much better without the header on it, growls at wot and has a nice rumble when downshifting, i have noticed that i can stay in first and creep in a parking lot without it surging like it used to
What do you mean (without the header on it)? A header is an after market exhaust manifold? I don't think you mean't that you are running without an exhaust manifold. Did you put a stock exhaust manifold back on?
i felt that it took away from the low end too much for my liking and the exhaust sounded like a honda, after going back to factory manifold low end power is back and mileage is a little better than it used to be, so the cat back work was worth it
I had bought the flowmaster DBX dual exhaust for my 2.0l. Sounds great and can feel the difference, just had to cut my valence to get the other pipe out to add the tips. Picked up the cat back from modern performance.