The New Edge SN95's remain amazingly popular, even though many aspects of their performance are largely overshadowed by the S197s. We here at Stage 3 Motorsports love the sleek SN95s and keep a ton of performance parts for these excellent Mustangs in stock including cold air intake upgrades, performance exhaust kits, and 3.73 or 4.10 gears that make your GT Mustang come alive off of the line.
What parts should I get first?
As with basically every other Mustang on the road, you should start with the intake system. A cold air intake or cold air intake and tuner combo package along with a powerful throttle-plenum and a set of underdrive pulleys will free up a bunch of the restrictions caused by the factory air box and give you a nice bump in horsepower and torque in an easy to install package.
What's the difference between a throttle body and throttle-plenum?
The plenum on your 1999 to 2004 Mustang GT is just a bit of tubing after your throttle body and before your intake manifold. A standard throttle body simply replaces your factory throttle body and leaves the stock plenum. A throttle-plenum, like the ones from BBK Performance and Accufab, combine the throttle body and plenum into one unit which greatly increase airflow efficiency. Throttle-plenums are, hands down, the better option and can give you a real power gain that you'll easily feel.
I'm confused about underdrive pulleys. Which do I need?
Ford, being Ford, changed the design of the water pump midway through the 2001 model year run. This means 1996 to mid-2001 Mustangs need to use a different set of underdrive pulleys than late-2001 to 2004 Mustangs. Peachy, right? Mustangs built before September 2001 need to use the older kit, and Mustangs after that date the newer kit. If you're unsure of your build date, then check out our image below:
How does a tuner work?
A tuning device is able to hook into and change certain settings of your Mustang's Powertrain Control Module (PCM) like fuel rates, timing curves, and other functions to get you more horsepower. All of our 1999-2004 Mustang GT tuners plug into your Pony's OBD-II port and can upload a new and improved tuning file in only a few minutes. Some of our more high-powered Mustang parts even require tuning to get their maximum performance and to avoid engine damage.
I want a better exhaust note. Stock is weak.
Then you need a cat-back exhaust kit for your 1999-2004 Mustang GT. Unlike the newer Mustangs that have their mufflers mounted behind their axles, older Ponies like the 1999 to 2004 Mustangs used a mid-muffler setup that requires more extensive cat-back kits in order to get a sound gain. If you want both sound and power, then you'll need a long tube header and mid-pipe kit for your 2-valve 4.6L V8.
How many modifications can I stack on before needing tuning?
Unlike the newer S197 Mustangs, the PCM in the 1999 to 2004 2V Mustangs is fairly basic and you can throw on an intake, throttle plenum (or throttle body), underdrive pulleys, and shorty headers before you need tuning. Tuning does help with even the most basic of upgrades, but it's not entirely necessary.
What are my supercharger options?
It's pretty much just Vortech and ProCharger centrifugal supercharger kits at this point. Whipple, Roush, and Saleen have discontinued all of their kits for the older Mustangs. ProCharger's kits are more popular and help your engine generate up to 400 horsepower.