misha wrote:Have you EVER removed a cat from the car and drove the car without it only with welded straight pipe instead of the cat?I'm not talking about a results on paper...i'm talking from my experience and experience from lots of people.
The only side effect is that engine is louder than with a cat.It will not run richer than with it.You just have that feeling and richer smell because the cat isn't there anymore to clean those exhaust fumes.
yes- I have been working on performance modifications and emissions equipment for 30 years. I weld in cat converters and have access to a dyno. There is more of an effect than noise levels on cars using 2 sensors ( 1 in or post cat) to monitor and adjust a/f ratios. Because the chemical makeup of the exhaust gas alters in the catalyst the second sensor does get a different reading. A horse power gain can be had if the cat was restrictive, but by the mid 1980's performance cats far out-flowed most mufflers. So with a performance cat not only will you have the same flow as no cat but a more accurate air fuel mixture and more powerful engine output especially at low and high rpms.
I don't spend the $100 on a magnaflow cat because I want to get rid of profits. I do it because it makes more power, allows the safeguards on the a/f ratio to remain in effect, gets better mpg, passes emissions and retains the value of the car.
