We are offering Porsche 991 Turbo cat bypass pipes at the lowest price anywhere. These pipes are an amazing addition to anyone that likes to track their Porsche turbo. They free up the major restriction with the stock exhaust. The OE system on the 991 turbo is built to maximize performance, the factory cats are the restriction and the issue.

These bypass pipes are easy to install, are very low cost, produce an amazing bump in power, spools up much quicker while bringing the power on much faster and they are made in the USA. We have them in stock and they can be shipped out the same day.

If you have any questions regarding them, please feel free to ask me about them.

If you order these pipes using the link provided I will ship them for free too. Just pick the free shipping tab at check out.


PORSCHE 991 TURBO BYPASS PIPES

 

Wouldn't it be more interesting to make a switchable cat and muffler bypass valve?

 

Isn't the stock exhaust where the restriction is and less so the cats? Just curious.

 

What we are making is an inexpensive option.

We have tested many configurations and the cats are the biggest restriction. The stock system is restricted but we have tested many of the aftermarket exhausts and have seen great results with the factory system.

We have the facilities to test all of these products and we have been taking advantage of all of these new tools. When installing the cat bypass without a tune the car runs a little leaner but makes more power and it spools up a lot faster.

When adding a tune that makes up for this the increase in power is tremendous.

 

You can take a look for yourself at how well these parts are working.

Here is a dyno chart with the stock cats vs. the cat bypass pipes.

Notice how much quicker it gets up on power? Also, the line at the bottom is air/fuel, look at how much leaner the car gets with just the bypass pipes on the stock exhaust.

JUST USING HIGH FLOW CATS-
AVERAGE HP increase is 21 horsepower
AVERAGE TQ increase is 19 ft. lbs.



When we add our tune (even a conservative one) we get incredible amounts of power but this thread is about the huge improvements available from the cat bypass pipes on a 991 turbo.

 

Hi Staff

Excellent work glad someone has gone and tried the decat option on the standard muffler and like you said it's an inexpensive option to try as surely most the restriction will be in the standard factory cats?

I don't really understand the graph unfortunately but have you confirmed and analysed your dyno results and if so what is the difference you noticed with this type of setup against a car which has a full aftermarket exhaust with sports cats/decats or even using straight through pipes and maybe with even aftermarket headers?

Is there lot of gain difference to justify the price difference with this setup or going with a full on aftermarket system?

Thanks

 

As if the owners of a $200k car want an "inexpensive option".

 

I don't get what your trying to say to impose here???

Staff has come out advertising a product which seems to prove it works at a fraction of a cost what is wrong with having an inexpensive option as not every owner would be minted or would be happy spending thousands when similar gains can be had for hundreds???

 

We have tested some cars that have used other exhaust systems. It's not my place to put the results of those tests out here unless it was on one of our own cars. If we were happy with those results though we would have one off those exhausts on our car.

I am sure if the results were proven than some of those companies would post their own results on the forum.

Their is a big difference between inexpensive and cheap.

By us making an inexpensive options means that I am building something that works and does not cost a lot to build. The part is made 100% in the USA (in California) and it fits right and is made using stainless steel.

I would consider it cheap if I had it made in China, using inferior materials and crossing my fingers that everything fit perfectly.


I will happily sell very expensive parts for those customers that want that too but most of the parts that we actually sell are the expensive parts because they fit well and perform well. This part happens to fit and work well at a low cost.

 

Did you find that the stock headers caused any restriction?

 

I have not done any type of extensive testing with the exhaust manifolds at this time so I cannot give you any data in regards to that question.