From a personal experience: I removed the CAT once on an older Bonnie and I havn't done it since.

I'm having trouble wrapping my brain around the idea that removing the cat will cause a loss of low end power, but installing a high flow cat is a good idea. :?:

I'm thinking it'* time to replace the cat in both my vehicles because they are both original and have high mileage on them. I will go with magnaflow and get both for less than the cost of one.

It'* not a straight "gained power" curve when you free up exhaust flow. At some point, power goes down.

I just can't understand why removing the cat would cause any loss in power. The exhaust velocity and back pressure are still present because the exhaust pipe and muffler are still in tact. Most of my mechanical experience comes from old Trans Ams and the first thing we did on any 70'* T/A was to remove the cat and put glass packs on it and the increase in horse power is the best bang for the buck out there. I don't understand why there would be any power loss. My problem is that I am not very familiar with newer computerized engines and didn't know if the computer recognized that the cat was gone and would make the car run bad or not. I just cannot see how the car would lose power when the exhaust is still intact. I could understand it losing power if the exhaust was removed from the manifolds but we are talking a full and complete exhaust system in tact minus the "restrictive" cat. And if I get a high flow cat that means it'* no longer restrictive and would be the same as using no cat. Sorry, I'm just not getting the loss in power that is being spoken of.

Like I said, just wondering if the computer would get bad readings, thus cause the engine ti run bad, if the cat was removed.

Hey, Hoosier! You only have one oxygen sensor before the catalytic converter, so your engine can't tell if you remove the converter. However, that is a terrible idea since if your catalytic converter is so plugged up that your car doesn't run right, you can't just remove the blockage and keep your car going badly. You're probably running rich, so please address that first. Have all sensors checked and make sure the car'* running with a proper A/F ratio. Then, when you get your catalytic converter problem taken care of, hopefully with a high flow converter, you'll have a much better car overall.

94s rule!

Also, check this out:
http://www.bonnevilleclub.com/forum/...ic.php?t=93272

Ed doesn't sell cats. It'* severely illegal to sell a used catalytic, except for scrap.


Also, I'd love to see dyno results on the exhaust issue on the Series 1, but I believe it is documented on the Series 2.

Fellow Hoosier! Yes, I'll get the other stuff checked out first and address the cat last. now that i see they are reletivly affordable, it should be no problem replacing it with a high flow.

Good to see a few steps in the right direction. Good luck fixing it all up. There are lots of knowledgeable people here.