Stages

997 Turbo Exhaust

We offer two different 997 Turbo sport exhausts. Both are loud exhausts.

Stage 1 exhaust:

reuses the stock ø 60mm oval tailpipes (tailpipes not included)
maximum backpressure: 0.18 Bar / 2.6 psi (stock exhaust: 0.44 Bar / 6.4 psi)
minimum + 18 hp / + 22 Nm
price: 3500 Euro + sales tax / 4760 USD

Stage 2 exhaust:

comes with enlarged OEM chromed oval ø 76mm / ø 3 inch tailpipes
maximum backpressure: 0.12 Bar / 1.75 psi (stock exhaust: 0.44 Bar / 6.4 psi)
minimum + 20 hp / + 24 Nm
not recommended on Tiptronic
not recommended for owners with sensitive ears
price: 4200 Euro + sales tax

The stock 997 Turbo exhaust uses ø 118mm 600 cpsi catalytic convertors (cells per square inch)
Our 997 Turbo sport exhaust comes with less restrictive ø 153mm Emitec 100 cpsi sport cats.

The sport exhaust features:

extra large ø 153mm / ø 6 inch 100 cell sport cats
heat shields around the sport cats
big size ø 84mm transition tube between sport cats and mufflers
big volume mufflers
expansion bellows between the mufflers
heat shields around the mufflers
same weight as the stock exhaust
same ground clearance as the stock exhaust
extra low backpressure
4 year full warranty
high tonal quality

The foils of our ø 153mm sport cats are perforated with holes so the exhaust gas flow can enter into the neighbouring channels. Conventional cats have just an axial flow pattern while our cats will flow axial, diagonal and radial. The exhaust gasses spread evenly inside the cat which results in lower backpressure. These type of cats are also used on the current Porsche Super Cup cars.

The cross section of our ø 153mm sport cats is 40% larger than ø 130mm cats, 60% larger than ø 118mm cats and over 100 % larger than the commonly used ø 108mm cats.

These big size 100 cell cats will create less backpressure than higher density cats of the same size. (same diameter + length) Low backpressure on turbocharged engines is beneficial for both the horsepower / torque and the throttle response.

The volume of the sport cat, its total surface area, the amount / content of the precious metal coating and the addition of heat shields are the key factors in having a long lasting trouble-free cat converter.

A large catalyst surface area allows for better exhaust gas conversion efficiency, durability and cleaner air.

We don't offer 200 cell semi-sport cats on our sport exhausts because these are more restrictive than the real 100 cell sport cats.

Our big 100 cell sport cats do not cause emission issues or check engine light problems.

The heatshields around our catalytic convertors allow for quicker heat up during cold start and to prevent them from thermal shocks. The muffler heat shields reflect radiant heat away from the engine timing belts.

Our sport exhaust makes the 997 Turbo sound like a Porsche, not like some kind of loud car. As soon as you're making boost (0.2 Bar on the dashboard) the turbo whistle becomes very prominent. Also, everytime you let off the gas abruptly, there is a woosh sound which is really addictive.

The exhaust comes with an installation guide, new hardware and the proper tools.

997 GT2 Exhaust

Stage 1 exhaust:

reuses the stock ø 65mm tailpipes (tailpipes not included)
maximum backpressure: 0.16 Bar / 2.3 psi (stock exhaust: 0.38 Bar / 5.6 psi)
minimum + 20 hp / + 24 Nm
price: 3500 Euro + sales tax / 4760 USD

Stage 2 exhaust:

comes with stock-looking ø 76 mm / ø 3 inch stainless steel tailpipes
maximum backpressure: 0.12 Bar / 1.75 psi (stock exhaust: 0.38 Bar / 5.6 psi)
minimum + 24 hp / + 28 Nm
price: 3800 Euro + sales tax

997 GT3 / RS Exhaust

Sport exhaust:

at idle the exhaust note has a nice rumble
under power it has a deeper, louder, cleaner more refined sound
zero resonance
saves 13.5 kg / 30 Lbs
same hp as stock
succesfully used by race teams in the FIA GT4 championship
with straight tailpipes or with a flange that accepts the stock tailpipes
price: 1750 Euro + sales tax / 2380 USD

Quiet track exhaust:

6 dB quieter than the stock exhaust
saves 7.5 kg / 16 Lbs
same hp as stock
price: 2740 Euro + sales tax

Loud track exhaust:

replaces the side mufflers and center muffler
same hp as stock
saves 25.5 kg / 56 Lbs
accepts the stock tailpipes
for race track use only
price: 460 Euro + sales tax / 625 USD

100 cell race cats:

replaces the stock catalytic convertors
in exchange
minimum + 8 hp
price: 1210 Euro + sales tax / 1645 USD

996 Turbo Exhaust

All the older Porsches like the 964 Carrera, 993 Carrera, 993 Turbo, 968 Boxster but also the 996 Carrera, 996 GT3 and the 996 Turbo come with 300 cpsi catalytic converters from the factory.

The sport cats on our sport exhaust system have 100 cells per square inch. We don't offer 200 cell cats because these are more restrictive than the genuine 100 cell sport cats.

As long as the surface area of the 100 cell sport cats equals the surface area of the 300 cell stock cats, then there is no need to use the more restrictive 200 cell semi-sport cats.

We have never had check engine light problems or exhaust gas emission issues since we started using these 100 cell sport cats on our 996 Turbo sport exhausts since November 2000.

Stage 1:

big size ø 130mm 100 cell sport cats
slightly louder at idle but loud and exotic under hard accelerations
maximum backpressure: 0.18 Bar / 2.65 psi (stock exhaust: 0.36 Bar / 5.3 psi)
minimum + 17 hp
fit the original and aftermarket tailpipes
tailpipes not included
price: 3060 Euro + sales tax / 4160 USD

Stage 2 loud:

big size ø 130mm 100 cell sport cats
ø 70mm piping (stock exhaust: ø 60mm)
maximum backpressure: 0.15 Bar / 2.2 psi (stock exhaust: 0.36 Bar / 5.3 psi)
loud at idle and even louder and intoxicating under accelerations
not recommended on Tiptronic
not recommended for owners with sensitive ears
minimum + 18 hp
enlarged OEM oval tailpipes or enlarged OEM dual tailpipes included
price: 3690 Euro / 3855 Euro + sales tax

Stage 2 quieter version:

identical performance characteristics
slightly louder at idle and loud and exotic under accelerations
best on engines with bigger turbochargers
enlarged OEM oval tailpipes or enlarged OEM dual tailpipes included
price: 3690 Euro / 3855 Euro + sales tax

997 S Exhaust

A stock 997S with it's 3.8 L engine of 355Hp has ø 55mm primairy exhaust tubes which is the same size of tubes as the older 996 3.4 L engine with 300 hp. To cope with the additional airflow of the larger 997S engine, our sport exhaust system uses a combination of ø 60.3mm and ø 63.5mm primary tubes. (ø 2 3/8 inch and ø 2 1/2 inch)

The stock 997S headers have ø 42mm tubes. Both the 997S X51 and 996 GT3 headers have ø 48mm tubes. We have build and tested several equal lenght headers in both ø 45mm, ø 48mm and ø 50mm tube sizes. Eventually the OEM X51 headers turned out to equally good but without having the inevitable ground clearance issues.