Yeah, I too faced the same issue. Unless you can convince the local crowd here that by "performance" you really mean "better fuel economy" they will all look at you like you are the village idiot and throw e-rocks at you.

I am working with K&N for a replacement filter for the HCH II but the design of the filter for the HCH and HCH II are a bit different in actual shape.

The basics will net you the same results. Intake and exhaust are the starting pounts. I would personally avoid and programming changes as there is a possibility that any changes that are made could have a bad effect on the IMA.

Ignore those who cry "what about your warranty" and do a search for "magnusson moss". The Magnusson Moss act describes how aftermarket parts cannot void a warranty unless it is 100% proven to be responsible for the damage.

One poster pointed out a truth. This is a hybrid forum. You are not going to find anyone here that can relate performance to economy without being snide about it.

Now if you ask them about running out of gas on the interstate in the interest of trying to get 700 miles out of a tank of gas...

Funny how one forum can act like YOU are the idiot for wanting a little more spunk in your car while at the same time members are intentionally running out of gas and tailgating Semi-Trucks to see how far they can push a tank of gas.