The loudest, most powerful exhaust for your GT4RS! This system deletes valves and the muffler for the ultimate in power and performance. BE WARNED! This is LOUD and drones. Not recommended for sensitive drivers, passengers or neighbors! Makes 32whp at 8000rpm and 37lbft at...

Great Sound, and Great Power without drone!   We have spent the last TWO YEARS building, testing, iterating and improving this design. Now it's finally ready.   Using the latest technology in additive manufacturing, made from 347SS 3D-printed internals, this design keeps the “valve-open”...

In testing the 991.2 GT3 and RS we found the air intake to be restrictive, the 718 GT4RS shares a VERY similar engine architecture and the restriction at the throttle body is no different. With the addition of the larger 93mm Throttle Body and...

The Valkyrie Complete Aero Package includes: Valkyrie Swan Neck Carbon Wing Dual Carbon Dive Planes Carbon Splitter with 3D-printed lip spoiler and vortex generators The Complete Dundon aero package for the 991.1 GT3RS was designed to increase downforce while minimizing the drag coefficient. Using...

Only for cars previously equipped with Dundon Street Headers. MEGA Crack Pipe deletes valves and muffler, for the lightest, LOUDEST system. Not recommended for sensitive drivers, passengers, or neighbors! Technical Description We spent TWO YEARS building, testing, iterating and improving this design. Using the...

We built the lightest, LOUDEST, most powerful exhaust for your GT4 Clubsport. No valves, no muffler, no compromises. Not for the faint of heart or for tracks with sound restrictions. Ear plugs not included! Dundon tuned-length 321 stainless steel Clubsport headers feed straight into...

1. Eliminates the OPF  2. No Check Engine Lights, and no tuning required  3. Significant power and torque gains: +31whp/+55wtrq! 4. Weight savings over stock: 321 Stainless Steel Muffler version: 10 lbs lighter than stock Titanium Muffler: 25 lbs lighter than stock Inconel 625...

Get the best sounding, most powerful exhaust for your 718 GT4. No compromises. Over 3 years in development and (over!) 11 Prototypes to get it right.   Great Sound, and Great Power without drone! This is the complete exhaust upgrade for your 982/718 4.0L Boxster...