questionsthings that go vrroooom?

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@woothulhu: Thanks for the links. Going to follow up on these. Do you have any experience with this brand?

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@happyknappybeard: I love, love, love KNN. You should see a light jump in HP, plus it's the last air filter you'll have to buy

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@woothulhu: I love the sound of that. Was there any noticeable change in fill up by chance?

I love the fact that you can self install. So far this is at the top of the list.

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@happyknappybeard: If you mean gas mileage, that's affirmative. Better aspiration equals better combustion.

Also, just make sure your to keep your fuel injectors clean and your spark plugs fresh. This is a really easy way to prevent the slow decline of gas economy.

In reference to your fun fact: People think you're That Guy who bought That Car?

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@woothulhu: Had the plugs covered but I'll have to look into the fuel injectors. Thanks for the tips...you just might have kept me from walking everywhere!

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KN air filters may or may not improve efficiency & HP... a lot depends on the car and your ability to maintain it..
Check out on-line forums for your particular Ride... You will find an incredible wealth of knowledge & experience on-line... Also a source of DYI instructions, projects and parts...

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Not an answer to your question but did you know you can still add an extended warranty? I did that when my extended warranty ran out. It's a big cost up front but it has more than paid for itself (think 4 new bushings with only $200 co-pay).

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It will add at least 47.4 HP

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At lot of advice regarding what to do to increase fuel economy or power or torque often follow advice and practices from the days of carburetters and it doesn't fully translate into the world of computers. Your car's computer is your worst enemy here. However after a little explanation there are a few things you can do.

Your car's computer is designed to maintain a ratio of fuel to air in the combustion chamber. Why? To pass emissions. A too complete burn produces to many NOx's, which is bad for the air, and it is one of the things your car is screened for when you go for a smog check. To lower NOx's your car has to leave some fuel unburnt which the catalytic converter will deal with(the converter requires of certain ratio of fuel to NOx to carbon monoxide to work right). To achieve this the computer balances the incoming air which is measured by the mass airflow sensor on your air intake with the amount of fuel it injects.

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The nice part is that the sensors in the exhaust system are really simplistic it is just the airflow sensor that is the pain. So by adding more air in and a larger exhaust to help purge the cylinder faster, the onboard computer also adds more fuel. Hence your horsepower and torque also get a significant boost as well, but you also consume more fuel if you handle the throttle exactly as you do now. Now the advice...

1.) Regardless of what modifications you perform, relearn to drive your car. That means paying attention to how much throttle gives you how much performance and not to become to enthralled in your car's new found power. If you're aiming for any semblance of fuel economy, then get yourself one of these: http://www.thinkgeek.com/gadgets/car/8426/ A scan gauge will tell you quite a bit, including real time fuel economy so you can play with how you drive.

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2.) Upgrade a system, that your car barely monitors, like the electrical system. The car strictly only monitors alternator charging rate and battery condition, that is it. Spark plugs, plug wire, distributor/coil pack output are completely ignored since their failure also means the car won't run.
Get yourself:
Better Plugs. Switch to gapless plugs which allow for a larger more consistent spark with elements that are less likely to foul. Bosch Platinum Iridium Fusion plugs are gapless there are plenty of others, that is just a reference. The larger spark means a better more consistent burn, especially if you feed in more air. The change in emissions is minor, within tolerances, and you get a smoother idle and slightly better throttle response.

Lower resistance plug wire. Lowering your plug wire resistance give a mild boost in amperage to your plugs generating a wider spark, or at least that is how it should work.

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An higher output coil pack and or distributor. By increasing the output of your electrical system you generate a larger, more powerful spark, which helps promote a more even combustion. Brands like Accel are one route.

Theres more to come, I just need to gather my thoughts.

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@crabnebula: Thats ok. It'll give me time to process all of that. This is very interesting.

@thunderthighs: That is an option I should probably explore. Thank you.

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@crabnebula: Good info... I forgot to mention ScanGuage, I have one on both cars and one of the displays is always MPG...

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2) Exhaust Systems: A couple things to remember, the statistics are overblown on these. You get a horsepower boost, but not as dramatic as those dyno test they show you. Those are on pristine broken in vehicles. More importantly the job is to improve flow. However there is a choke point that you cannot improve, your catalytic converter. It is welded in place, removing it is fatal to your performance and most importantly it helps produce the necessary back pressure for the exhaust system to operate, as backwards as that sounds.

However you can improve it. Switch out to something stainless, with a larger bore and a decent performance muffler. Nothing too extreme, no one else wants to hear your Charger from a mile away. Often there are stealth exhaust systems that incorporate 2 mufflers in-line to create the same noise reduction of a stock muffler without unnecessary flow restriction.