The first things to do are to get an intake and at least a cat-back exhaust if not full exhaust and even a header if you can install it. You have the coice between a cold air intake or a warm air intake. If you live where it rains and puddled water will find its way into your federwell, pretty much anywhere but Califormian or the desert, a cold air intake will suck water into the motor. You can get by-pass valves to help with this but they don't keep all the water out and then they take in un-filtered air. The best choice, and it is only rated 1-2 HP less than cold air, is to get a warm air intake which stays in the engine compartment. It will give you a smoother intake tract, a better filter that is usually a lifetime warrantied filter and it will bolt right in. Don't scrimp on getting a cheap one. The best ones are; AEM and K&N. There are others and the places I gave you for parts only carry the good stuff. As far as exhaust, if you live in California or plan to, you have to make sure you get CARB legal stuff. Getting a header and exhaust all the way back is expensive but will give you the most bang for your buck as far as engine breathing when used with an intake. Again, go to Horspowerfreaks and they will probably guide you towards the best combination for your vehicle and keep you emissions legal.
Don't get into injectors and stuff like that as you can do a lot with the stock ones and changin them can cause issues if you don't have the need for them. Only highly modified motors really need bigger injectors.
If you want to tune your air/fuel ratio once you get your intake and exhaust, get an adjustable fuel pressure regulator and a wide band air/fuel ratio gauge. This is the best way to get the most out of your injectors as the proper air fuel ratio will give you performance as well as give you better gas maileage. Biger injectors can actuallly take power away and waste gas.
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Wednesday, February 22nd, 2012 AT 12:39 AM