Do you want the most ridiculous, the most absurd, the most insane and craziest sounding exhaust out there? Step right up. As made famous by our 997tt back in the day...


We have completed our prototypes and are now offering on a built to order basis, the 991tt Straight Pipes...

Having a number of already proven performance products for the Porsche 991 Turbo already, we wanted to make something that that would would be loud and generate the best performance! We enlisted the help of our fabricator and developed a muffler-less and cat-less design that would provide the least possible back pressure. Being that the Porsche is turbo charged the the lack of back pressure would allow the turbos to spool up faster and generate optimum horsepower.

This new design features 3.5″ stainless steel piping that fits perfectly with the existing factory Porsche exhaust tips. These retains the 02 sensors bungs but delete the catalytic converters, so unless you have a tune these will produce a CEL on the dash.

We tested these on our 991 Turbo and kept the only variable different being the exhaust. Already equipped with the AP Tuning Box, AP Y-Pipe, AP Intakes, and AP Headers, this car has some *****. With the straight pipes, the turbos spooled up much quicker making peak torque almost 400rpm quicker. From the start of test at 2500 rpm to 3800 rpm, the car made an additional 65 ft/lbs of torque. Torque stayed strong through the mid range with an additional 25 ft/lbs. Horsepower was increased in the mid range around 5200 rpm with a peak of about 40 awhp. All of these tests were done on our Mustang AWD Dyno with 91octane and an ambient temperature of around 90F.

and I messed up the title Bazooka**

Any videos or sound clips while driving? Does it pop every time you shift? How is the cabin noise while cruising? How much is this system?

If you already have a VR tuning module will additional tuning be necessary?

The only additional tuning you may need is to remove a CEL that these will throw.

How would you go about that...I assume that is something that will be flashed into the vehicle?

Yes, something like a bench flash or cobb would clear it

Interesting. How does this exhaust compare to an x pipe without cats or mufflers?

More power, more torque, less back pressure, turbos spool faster, CRAZY loud.

Peak torque was hit 400rpm quicker with these on. The video really doesn't do it justice though; if you want the craziest sounding, loudest exhaust, this is it.

Who wants to have the most ridiculous exhaust out there?! PM for more info!!

how much weight does it save from the stock system?

I will try to get one of these systems weighed today, I believe our test set is in the shop.

The catless system weighs roughly 8.5 lbs. Stock muffler alone is ~24lbs, not including the cats which will save another 15-20 lbs.