Get the best sounding, most powerful exhaust for your GT4RS.  No compromises.  Over 3 years in development and 11 Prototypes to get it right.   Great Sound, and Great Power without drone!   We have spent the last TWO YEARS building, testing, iterating and improving...

The Dundon D4 Package is the culmination of our work on perfecting and guiding the pressure waves into and out of the 3.8L Engine resulting in 72lbft max gains over stock and 100whp at the rev limiter.

Dundon 981 Race Headers provide substantial gains in torque and horsepower throughout the rev range. They are a race system so are for track or off-road use.

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...

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!

We built the lightest, LOUDEST, most powerful exhaust for your GT4 Clubsport. No valves, no compromises!   Not for the faint of heart, or for those with sound restrictions! Ear plugs not included! :-)

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...