2014-2018 Mazda 3 Skyactiv Engine and Performance
I have a project air-cooled V-twin (7k -8k rpm) carburetted motorcycle on which I've modified many times over for the past 15 years..... and I've learned a lot of things with that vehicle. I bought it brand new, and one of the first mods was a $250 after-market exhaust (not a full exhaust, but...