Correct. We've done numerous dyno tests on this subject. And just to add and clarify... the high flow cats do not do as well emission wise. The less cell count, the less effective they are. Because of the lower cell count, you can't get as much platinum and/or Palladium in those bricks. Hopefully this thread doesn't get jacked because of this but a similar analogy would be with high flow performance mufflers vs oem mufflers. When you replace your OEM mufflers with performance aftermarket, you get higher flow but you also get unwanted drone and resonance. As with most good things in life, you can't have your cake and eat it to. :)