Been a little over a week now since I installed the Green Filter. I have finally had a chance to get it on the highway and open it up. There is a little more intake sound over the stock filter. Sounds good. The 17 year old in me still loves to hear the roar of a big V8. I keep waiting for this filter to give me better mileage, but my mpg looks the same as before I installed the filter.
So, in short: a little more intake noise under acceleration and a bit more seat of the pants pep. That is about all you get. I do like the fact these are made from recycled materials. So, overall, no complaints.
Do you have stock exhaust? That would be interesting.... To see what would happen with a duel exhaust system with better flow. Would the addition of the filter then make a difference in MPG?