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So I drive a 2014 Impreza Sport Premium, not a WRX or STI(I know I should have gotten one of these >.<). The car is automatic however I drive it in manual 100% of the time, yes with the flappy paddles. I've recently throw mudflaps on the car and have noticed roughly 4-8mpg decrease, was curious if anyone has seen this occur? I did do some research and saw some people said there would be very minimal mpg decrease, but i didn't think it would bring me down from 27mpg to 20~23mpg. The other thing I was debating, it's nice and cold here now, would cold weather have effect on a cars mpg? I did notice that due to cold temperature the mpg digital read jumps around a lot and is quite slow and inaccurate at reading when its below 32 degrees outside. The alternative way I've come to guessing how my car is doing is by matching the amount of miles to the amount of gas. For example, usually when the first 3 bars of the tank are gone I should have about 100 miles, sometimes a little less, on the tank, some times a little bit more - but since installing the flaps its been about 70-80 miles on the tank when those bars go away. There's only 6350-6400 miles on the car and I just had my second oil change. Now for the other questions, keep in mind, I am very grateful for all and any answers. To start things off, the car is still under warranty, so I am hesitant to doing any modifications for now, unless someone can explain why my warranty would not be voided. Either way, I am looking into potentially doing a CAI or an exhaust, potentially both after a period of time. Some questions I have, if doing a CAI would I need to tune my car after? I was reading that you would want to but it looked like that was mainly around cars with turbos. My question is, if my car can support a CAI, would it need to be tuned after installation? If so, can someone explain to me why? My other question regarding an exhaust; if I do an exhaust(was currently looking at the Borla Axle Back) would I need to have the CAI to compensate for the output of the exhaust? Some of my friends tell me yes and some no, so I am resorting to you guys for better input. Any sort of guidance on these is much appreciated. I am not a car person, I work with computers, my friends are the car ones - with conflicting information I like to get a wider groups input. Thanks in advance for any input/guidance you guys have for me.