To be honest, i didnt really have any high rpm passes on the stock exhaust and i never really even put the hammer down on the car.
Just from taking it easy though around town - I think it may have lost a little on the bottom end and maybe gained a tad at the top...pretty much no difference except for look and sound.
2008 Base 2.4L Manual
Sly Exterior, Black Top, Two Tone Interior
Preferred, Premium, Convenience Packages
Monsoon, Floor Mats, A/C
GXP Dual Exhaust/Fascia
Sport Metallic Pedals, Spoiler