Reviewed By Donald F (SUTTER CREEK, CA) Reviewed for a 2005 Mazda B-Series —4/7/2016 10:15 AM
I'm not sure about the horsepower gain, but performance does seem more to have improved. I also added Bilstein shocks from Auto Anything and a Magnaflow muffler I bought locally. So the engine is breathing better, sounds better and the truck rides better. I've used the K&N air filter replacements for years and been very happy, but this time I wanted to go for the added performance the FIPK offers.