Categories FAQ

Often asked: Audi a4 high flow cat?

Do high flow cats add horsepower?

Do highflow catalytic converters add more horsepower? Adding a highflow catalytic converter to your car can add horsepower since it does free up the exhaust flow overall. However, it’s usually recommend as final piece to your exhaust system, especially if your car is making at least 20 percent more horsepower.

Does a high flow cat increase sound?

Yes, high flow cats are less restrictive than stock and will allow more sound to pass through your exhaust system.

Do high flow cats make your exhaust louder?

Will a high flow cat make my exhaust louder? Yes, high flow cats are less restrictive than stock and will allow more sound to pass through your exhaust system.

What are the benefits of high flow cats?

A high flow catalytic converter allows exhaust gases to flow through at a higher rate, lessening the restriction.

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Do you need a tune with high flow cats?

No high flow cats do not require a tune. As you are well aware, they will be optimized with a tune. As a personal opinion, get as much money back off of the extended warranty and void the hell out of any possible factory warranty you might have left, which can’t be much at this point.

Do high flow cats smell?

High flows are called high flows for a reason. They flow exhaust fumes at a much higher rate, therefore a lot less “smell” (fumes) get trapped in the cats. “It works 60% of the time, every time.”

Will a high flow cat pass inspection?

That being said, if you put a 200 cpi metallic high flow cat on your car it will most likely pass the tailpipe emissions test once warmed up AND it will only fail the visual test if the tech actually crawls under your car to verify the cat stampings.

Do high flow cats improve MPG?

In addition to free flowing mufflers, high flow catalytic converters can be used to increase exhaust flow and gain better gas mileage. Gains of 1-2 MPG have been documented when switching to high flow exhaust systems. Replace your stock muffler with a high flowing performance exhaust.

What is better 100 cell or 200 cell cat?

The 100 Cell will have up to 95% Airflow, is not OBD II compliant and no warranty for OBD II. They have 3 winding centers, therefore they are more durable than the 200 Cell cats. They will give a CEL after 10K miles. They are for racing/track use, but can be used on the street.

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How much HP gain from cat back exhaust?

In terms of power, though, that’s objective data. The new exhaust adds two pound-feet of torque and 2.5 horsepower, but only once VTEC kicks in and the engine needs more airflow.

Can you shoot flames with a high flow cat?

But yes, if you want to shoot flames your best bet is catless with a straight through muffler design. After fires are potential “flames” and anything in their path before they escape the exhaust will hinder their visibility.

Are high flow cats legal in California?

To be legal in California, a replacement part such as a new catalytic converter must come with a CARB (Calif. Air Resources Board) “sticker” or must be a direct OEM replacement part. There are no “high flow cats” that have a CARB sticker issued for them.

Are high flow cats illegal?

Technically they are legal if you can pass emissions (only some counties require this). However it is illegal to change the cat before 5 years or 50,000 miles unless it has been damaged or is no longer working. So, if you go into a shop with 5000 miles on your car and hand them high-flows, they will likely say no.

Is a Catback exhaust worth it?

It’s almost pointless (for performance) to just do cat back. The down pipe and cat are the two most restrictive parts of our exhaust. But yes, it’s worth it for the sound.

Does cat delete increase HP?

Removing the cat will have almost zero impact on engine HP. The exhaust will be slightly less restrictive, but that will cause unnoticeable gains. A more effective way to boost HP is to retune the engine, by advancing the timing.

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