I have a 2015 mustang eco-boost, The only modification is the Roush cold air intake. Will the y- pipe increase the horsepower at all, or will it just make the car louder? What is the next least expensive modification I can do to increase the horsepower?
I have a 2015 mustang eco-boost with no tune. I had my spark plugs changed over the weekend, Picked them up at AutoZone with a .028 pre-gap, Ford Motorcraft plugs. My mechanic insisted that the correct gap for my car was .031. So he adjusted the gap. Is .031 the correct gap for my vehicle? The...