HP Gain and CARB Exempt!
Small HP increase but was able to feel the difference. Illustrated installation instructions was a plus but there was a small variation in the removal of the air inlet duct and resonator. The illustrations on the duct & resonator were probably for pre-2007 TSX's. Won't need to do a Calif. smog for another 2 years or so since I just got the car and smog was required for the transfer of ownership. However, the CARB exempt sticker with reference number should resolve any issues.