[Grendel]

I did notice a slight benefit in economy, but I really had to make an effort to drive the same way as before the exhaust change. I don't believe the benefit in economy could justify the price of the exhaust based on that alone. Now that I did my test to see if my economy did change, all of that went out the window. The response improvement and sound change make it VERY hard to drive conservatively. I don't know how much power (torque and/or hp) was added, but it was noticable.

About a week after my install of the exhaust, I added headers and with the two together I was very pleased. The headers did change the sport exhaust's sound to one that was slightly deeper.