Welcome to the forum. You may want to check out a Mazda3 forum for ideas. The Mazda3 is a bigger version of our iAs and there are a heck of a lot more Mazda3s on the road. The Mazda3 has a 2.0 or 2.5 version of the same basic engine so no guarantee that what works for them will work for you, but it should be a good place to start. Mazda3Revolution is a good, active forum.