Hey guys I need a little info from someone who knows more about these thing then myself. I have a set of Roush axle backs that were on my last Mustang and I would like to put them on my new one but when they were on my 2011 I was losing torque I'm told it was because I didn't have a CAI on the car. I don't really want to pick up a CAI and a tune as I'm not interested to losing the warranty on my car. So my question is can I go with a K&N filter instead I've heard they let more air in. Is there anyone that's done this instead that can confirm this for me. Thanks
If you really lost torque on the '11 then it wasn't because of the axle back, if there is any change from them then it is on the positive side but it's negligible.
A drop in K&N filter also won't change power any, best you get out of it is that it is basically a lifetime filter, just clean it every 30-50K.