New to the forums. Have a 2014 forte5 sx. Bought it used with 5000 miles. I use the car as my work vehicle. I put 300-400 miles on it each day I work. Car has done really good getting 34mpg on the hwy. I bought my first mods today which is Spectre air filter and a boost gauge. Didn't install gauge today because my buddy can get free vac line at work. But I did install Spectre air filter today and was happy with the loud spool and blow off noise. Sounds really clean. I used stock intake pipe and just added cone filter. I noticed a power loss. It seemed quite a bit quicker with stock intake. I was surprised cause it didn't seem right. Was I suppose to do something else? I've heard of people disconnecting the neggative side of battery. Anyone know what's going on or have experience with something like this?