Underground Dynamics

HKS headers built for one thing — the track. This is pure race car territory, no street compromises, no half measures. $2,200.99 with free shipping included.

What series are you building for? 🏁

HKS RACE PART solely for use on purpose-built race cars, never to be used on a motor vehicle HKS3304-ST010 HKS RACE PART solely for use on purpose-built race cars never to be used on a motor vehicle HKS RACE PART solely for use on purpose-built race cars, never to be used on a motor vehicle. Underground Dynamics Shop now

Borla's S-Type axle-back for your 05-09 GT is the real deal — T-304 stainless, true bolt-on fitment, and that aggressive tone Borla's been perfecting for 40+ years. $888.99 with free shipping. 🔥

https://www.undergrounddynamics.com/products/bor11752-borla-axle-back

Stock, Roush, or full catback — where's your 4.6 build at right now? 🤙

Borla 05-09 Mustang GT 4.6L V8 SS Exhaust (rear section only) BOR11752 Borla 05-09 Mustang GT 4.6L V8 SS Exhaust (rear section only) For over 4 decades, Borla(r) Exhaust has been the choice of Mustang experts, from the Cobra-R SVT Mustang to the Ford GT. Major players in the racing industry and leading tuners from Roush.

The AE86 isn't just a car — it's a whole religion. Built in garages, proven on touge, passed down through generations of enthusiasts who just *get it*. 🔧 What was your gateway into JDM culture?

Cusco Strut Bar AS Rear AE86 TE71 CUS116 511 A Cusco Strut Bar AS Rear AE86 TE71 Cusco Strut Bar AS Rear AE86 TE71. Underground Dynamics Shop now

The 2000-2005 Impala deserves better than stock, and the Duraflex Skyline front bumper at $450 with free shipping is how you start the transformation. Clean lines, solid fitment, built to take paint like OEM.

https://www.undergrounddynamics.com/products/100007-duraflex-bumper-covers-front

What's the rest of your Impala build looking like? 🔧

2000-2005 Chevrolet Impala Duraflex Skyline Front Bumper Cover - 1 Piece 100007 2000-2005 Chevrolet Impala Duraflex Skyline Front Bumper Cover - 1 Piece 2000-2005 Chevrolet Impala Duraflex Skyline Front Bumper Cover - 1 Piece Duraflex Body Kits are perfect upgrade to your vehicle?s appearance. A body kit is a modification to a vehicle?

Every late night in the garage, every track day, every mod debated for months before pulling the trigger — that's what separates a car owner from a builder. What's the one mod that changed everything for your build? 🔧

2012-2018 BMW 3 Series F30 Duraflex M3 Look Rear Diffuser ( must be used with M3 look rear bumper) - 1 Piece 112507 2012-2018 BMW 3 Series F30 Duraflex M3 Look Rear Diffuser (must be used with M3 look rear bumper) - 1 Piece 2012-2018 BMW 3 Series F30 Duraflex M3 Look Rear Diffuser (must be used with M3 look rear bumper) - 1 Piece Duraflex Body Kits are perfect upgrade to your vehicle?