The 1999 to 2004 New Edge Cobras were the absolute kings of the street during their heyday, especially the 2003 and 2004 versions with their factory-installed Eaton superchargers on top of their 4V 4.6L V8. Even as these wonderful creations from SVT age, and their performance begins to be overshadowed by newer models, Stage 3 Motorsports is here to provide your Cobra (or Mach 1, for that matter) all of the aftermarket performance parts it needs to maintain its signature bite on the street or track.
Most "Day-1" Cobra owners start with intake and pulley upgrades. You can grab a quick 40+ HP with these mods and the proper PCM tuning. Your 4V engine has lower compression for the supercharger and that does wonders for your exhaust note. Check out our line of Cobra cat-back exhaust systems to really let your snake be heard. Stage 3 offers 0% Financing and 100% Free Shipping on all "Terminator" Cobra parts.
Where should I start?
If you have 1999 or 2001 SVT Cobra, then a cold air intake, PCM tuning, and a throttle body should be your first stop. This quick combination will help your naturally aspirated 4V motor breathe easier and get some easy horsepower and torque. 2003 to 2004 SVT Cobras can get a huge boost in power with a smaller supercharger pulley on their stock Eaton. An even better option is one of our performance packages that include a smaller pulley, cold air intake, and tuner that are capable of generating huge horsepower and torque gains with almost zero hassles.
What's all this about an IRS?
The 1999 to 2004 SVT Cobras came equipped with an independent rear suspension (IRS). As the name implies, an IRS allows the rear wheels to articulate completely independently of each other. Standard Mustangs come with a live axle setup where the rear wheels are linked together and causes articulation on one wheel to effect the other. An IRS generally provides for better handling, while a live axle is cheaper, lighter, and can handle more power.
How do I get a better exhaust sound
With a Cobra cat-back exhaust. Unlike newer Mustangs with their aft-mounted mufflers, the Fourth Generation Mustangs came with a mid-muffler design and require a full cat-back for any sound enhancements. Your average Cobra cat-back exhaust kit comes with new mufflers, kickover tubes, and exhaust tips and directly replace your factory components. Installation is pretty easy and all of our cat-backs clear the IRS.
I want put a smaller pulley on my supercharger. Do I need a new tune?
We always recommend getting a new PCM tune whenever you drop down a pulley size just so you get the most power. However, it is possible to go as small as a 3.10" pulley without a tune if and only if you don't have any intake or exhaust upgrades that increase airflow.
I hear the IRS isn't all that strong. How much can it handle?
The weakest link in the Cobra is the IRS suspension. A former employee of ours completely blew up his stock IRS doing a 4500rpm drop at the drag strip with a heavily upgraded Eaton, putting down no more than 475 horsepower. The IRS can take a decent amount of horsepower, but it all depends on how you drive. Hard drag launches will blow it up eventually. The daily-driver or road racing Cobra may never have a problem. You can grab a Billetflow IRS Brace for some extra security or do a complete live-axle swap, like our unfortunate Cobra employee ended up doing. A lot of stock Mustang GT owners would be happy to trade you rear ends!
How much power can my stock Eaton make?
The factory Eaton M112 supercharger can only handle about 500 to 535 horsepower before it's just churning hot air, and it's very easy to push it that far with just an intake, throttle body, pulley, long tube headers, and a good PCM tune. After that point, you'll need to jump up to a new Whipple head unit.