Should I go Catless or high flow?

Performance Difference

Less restrictive is better. Obviously, catless systems are going to be less restrictive, therefore offering the best performance benefit. While high-flow is a significant improvement to OEM, it still does not match catless. For people looking to aggressively tune their N55, we recommend catless.

Does going Catless make more power?

Going catless has the benefits of eliminating restrictions in your exhaust + reduces back pressure on the engine to allow for more airflow, thus more power.

Is a Catless downpipe better?

Aside from not making any additional power over a high flow catted downpipe, a catless downpipe is bad for the environment and can also be bad for you, your community, and your engine.

Do high flow cats make a difference?

Do high-flow catalytic converters add more horsepower? Adding a high-flow 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 Catless downpipe increase horsepower?

An aftermarket downpipe (MATOLA Performance Downpipe) usually larger in diameter and it either use a catted or catless configurations. Which able to create more power to your vehicle because it with high flow unit which allowed the turbo move gases away from the turbine more efficiently.

High Flow OVER Catless Mid Pipes!!! Here's Why....

Is Catless louder than Catted?

How much louder are catless headers from catted? Both are significantly louder. The high flow cats available for most headers don't go a lot for volume, but control rasp some.

Do I need a tune for Catless downpipe?

Bump on this. Seems there is no damage to engine in running a catless downpipe without a tune, and no performance benefit.

Are high flow cats better than no cats?

There are no noticeable performance gains in using off-road pipes (no cats) over high flow cats. If you go with no cats it will sound a bit raspier (my opinion), and your car will smell (fact). The smell is unburnt fuel, oil, etc.

How much HP does a high flow cat add?

Before adding a high-flow cat, your car should be able to produce 20% more horsepower than its stock setting. Especially with professional help, all of these modifications are much easier than you may anticipate.

Can you pass emissions with a high flow cat?

Nope it won't pass. If you live in California, I feel bad for you cause you can't have as much fun. So limited.

Are high flow downpipes illegal?

A catless downpipe is technically illegal as it violated emissions laws. Although there are "fixes" that can hide the engine codes and trick emissions tests, generally, you will fail emissions tests with catless downpipes. With high-flow options, you will pass emissions testing and are in compliance with the law.

Are Catless downpipes loud?

Sounds like any aftermarket downpipe will be louder, and from catted to catless isn't the biggest difference.

Will a Catless downpipe pass MOT?

In theory a missing factory fitted cat should fail the MOT regardless of the emissions readings. MOT testers are aware of what should be there and should be looking for them.

How much HP does a downpipe add?

It's generally accepted that installing a downpipe will add just 10 to 20 horsepower, but that gain is noticeable when the engine is revved up.

Is a downpipe good for your car?

Conclusion. Upgraded downpipes provide great increases in horsepower and torque on turbocharged vehicles by allowing exhaust gasses to flow easier as they leave the turbo. Paired with the appropriate software, a downpipe can provide significant gains and make a vehicle more fun and engaging to drive.

Are Catted downpipes worth it?

they are worth it because they are more free flowing and will give you some power gains, but nothing near catless. they are worth it because they are more free flowing and will give you some power gains, but nothing near catless.

Will a high flow cat be louder?

Well-Known Member. High flow cats will be a tad bit louder for sure. Depending on what you find loud, it may not be a significant amount however.

What are the benefits of high flow cats?

A high-flow cat is ideal if your vehicle is heavily modified or turbocharged since the extra airflow can help in adding more power. A high-flow catalytic converter is better than a normal cat. It increases horsepower, minimizes toxic gasses from your car, and roars a car's engine with a great tune.

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." "Some say it's a waste of time, others say it's an incredible waste of time."

Are MagnaFlow cats high flow?

Most MagnaFlow catalytic converters are higher than OE in flow capacity. The 400 CPI cell density of most MagnaFlow catalytic converters will out flow an OE for the same application while providing the necessary functionality.

How long do high flow catalytic converters last?

The truth is, on modern vehicles, the catalytic converter should last the life of the car or truck, given an "average" life of about 100,000 miles (160,934 kilometers). Good thing, too, because this auto part uses rare, precious and therefore expensive metals such as gold, palladium or rhodium.

How much does a tune cost?

Money equates to time.

Each setup is different, and also depending on what type of system is being used (piggy back, chip, stand-alone, supercharged, naturally aspirated, street or race only, etc) tune costs can range from $250 to $1500. Don't be afraid to spend money on a good tune.

Will a downpipe void my warranty?

Well-Known Member. It should not void any part of your warranty, but a dealership may void it anyway. As Mark said above, it is probably not worth the fight once it has been denied, even if you are in the right.

What is a high flow downpipe?

Similar to cattless downpipes, high-flow catted downpipes will allow your turbos to spool faster and deliver more power. However, as you likely assumed, these downpipes have catalytic converters and are more restrictive than catless downpipes. They still provide relatively solid gains for turbo spool, power, and sound.

How much louder is Catless downpipe?

I installed a ZZP Downpipe and it's about 3-4 times louder than it was with only the muffler delete and resonater delete. If you want to be heard from half a mile away, the downpipe will do it.