How much HP does a high flow cat add?

The amount of horsepower you will get from a high flow catalytic converter depends on your engine and the modifications you have made to it. You may see a horsepower gain of as little as 5 hp or as much as 60 hp. You may also get an extra 5-60 ft lbs of torque.

Are high flow cats any good?

If you’ve added a supercharger or turbocharger to your vehicle – or substantially increased the boost of an existing supercharger or turbo – you’ll likely find high flow cats a good investment in terms of maximizing vehicle horsepower.

Do high flow cats require a tune?

No high flow cats do not require a tune. As you are well aware, they will be optimized with a tune.

Will a high flow CAT cause a check engine light?

Ever wonder why headers and high flow cats cause check engine lights? It’s because the high flow cats are not filtering out as much stuff as the stock cats and the secondary O2 sensors detect this and set a code.

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.

Are high flow cats loud?

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.

Do I need a tune after high flow cats?

Do high flow cats pass emissions?

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.

Will a high flow cat pass inspection?

Hi, People say you can pass it without CAT as long as the car is tuned. They should pass the sniffer just fine with proper tuning. it will not pass a visual inspection.

Does a high flow cat make exhaust louder?

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.

Whats better no cats or high flow 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.