Onto a different note since this thread has turned into a car topic. I'm sure you have heard of K&N air filters, do you use them? I just bought one yesterday for one of my vehicles. The store I purchased it from had this air machine display where it shows how the K&N filter allows more air flow vs a standard air filter.
On the box says it can increase hp 5-15 hp, blah blah blah, I bought it for the better air flow so that my engine can breath better. I am not one of those people who buy into the gimmicks where certain add ons create and give you more hp. I have a Flowmaster exahust on my vehicle which has a 351 engine, I found no increase in power, at least I didnt notice it.
The sales Woman at the counter said that alot of her customers that bought the K&N filter for their vehicle have noticed better gas mileage out of their vehicle after purchasing and installing the filter, just was curious if you Jim Bob have ever used a K&N and whats your thoughts were about them.