One of the first upgrades that a lot of Mustang enthusiasts seem to love to make is an exhaust system upgrade. It’s just no fun if you can’t get into the throttle and make a raw Mustang power sound. We have a whole list of manufacturers and configurations to choose from. Brands like Roush, Billy Boat, Borla, Magnaflow are just a few of the brands that we work with. We even have S550 Mustang accessories like our Quick Time electric exhaust cutouts so you can open up your exhaust whenever you want for more power and an even louder sound.

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Another set of custom Mustang parts that seems to get upgraded quickly for the car enthusiast is the cold air intake system. We have everything you need to make this quick upgrade. K&N, Airaid, aFe - take your pick - they’re all easy installs and help you gain better throttle response and more horsepower. We even have bigger horsepower upgrades for your engine like our supercharger kit with all the Mustang S550 accessories that go with it. We also have a GT350 Coyote intake manifold that would go great with your other S550 performance upgrades. Whatever kind of performance you’re looking to make, we have the S550 Mustang parts you need.

If you’re already happy with the way your Mustang runs and sounds but want to add to the appearance of it, we have plenty of ways to help you out in that area as well. You can dress up your engine bay with our many S550 Mustang accessories like painted engine plenum cover, fuel rail coil covers, coolant overflow tank covers and fuse box covers just to name a few. You can even do an easy underhood S550 accessories upgrade with our billet aluminum custom painted engine cap upgrade. It’s a subtle touch, but it’s just enough to add a little something to your underhood appearance.

Your interior can be dressed up just the same with our Mustang S550 accessories. Painted door kick plates, polished speaker trim, custom A/C vent trim kits, floor mats, shift knobs, door sills and more. If you enjoy feeling like you’re driving a special Mustang than our interior S550 Mustang accessories are the best place to start. If you want everyone else to know that you’re driving something special, then our exterior Mustang S550 parts are the way to go.

As for emblems and stripes and brake and suspension components, we have all the best brands the automotive aftermarket has to offer. Call RPI Designs for ordering or questions about any S550 performance parts you see on our pages.