best 160 bucks iv ever spent
 

i just did a magnaflow cat on my 03 old alero v6 i was having transmission trouble also cat troubles. so i order the cat . replaced it and test drove it.. holly crap like a brand new car transmission shifts alsome can def feel allot of difference in tq... buy a magnaflow cat..

or just cut out your cat altogether :-) I did and I'm satisfied

cutting cat = horrible performance.

DON'T LISTEN TO HIM

Tell us more Cherrington.

I was going to buy a 'performance' cat recently but people in the know at work told me its a gimmick. The huge difference the OP felt is likely due to his former cat being clogged, causing his engine to choke on its own fumes. Mine wasn't that bad and when I changed it out it was like driving a different car.

Horrible performance? What are you talking about haha I noticed a gain in performance for sure!

I hollowed mine out and that bitch roars now.

Noticed it with your ass dyno no doubt.

PS Louder is not the same as faster

quoted for truth

i was JUST thinking that LOLOLOL :lol:

Attention morons, modded cat does not affect teh sound of exhaust.

attention captain deaf

it does.. trust me.

edit: are we thinking of the same cat? cause we're talkin about catALYTIC converters

Mine is no louder after being hollowed out. But it sure did pick up on some power.

You're the genius who took a stick and bashed the insides of your cat out, and you JUST said it roars now.

forgive him, for i think he's had a few drinks by this time of evening :lol:

If by cutting Cat you mean removing it and replacing with a pipe of same diameter, well you will get more performance than with the stock Cat.

However, your car becomes illegal and with all the testing that was done on dynos about the "High flow cat" VS "Cat delete" it was shown very few difference btw the two, lets say .2 hp difference.

Well heres to that at least. :drink:

Vinalero What do you say abt the universal cat vs 'high flow'?

Power wise. Sorry for your misinterpretation.

I wouldn't say that the max power is hugely affected, but the midrange mos def is.

OMG!! Not another animal abuser thread!

Rofl.

you know what you should do next??
Drill some holes in your muffler then put sheet rock screws in it to give it some tone. :) Lol

I lol'd

IMO, stuff some broken glass in your tail pipe. Home made glasspack ftw.

Hahahahahahahahahahahaha :glare:

ahh yess i agree

Sorry if anyone got offended by my comment. The reason I mentioned it was because on my delta, everytime Id open my cutout, gas mileage would get worst, and I didnt feel much difference in power. The sound was actually pretty nice though and thats why Id keep it open.

no i think people are just messing around. all in good fun.

in this April's issue of Import Tuner (yes I know referring to an import magazine on a domestic car forum is a bad idea) They dyno tested and compared stock catalytic converter to a "gutted" stock cat and a test pipe in place of a cat converter the test car was a Miata for each test they did three 4th gear pulls to establish an average baseline. The first run they used the stock cat and ran an average of 104.1HP/92.63TQ second run was the gutted cat and ran an average of 103.0HP/92.1TQ and the third was with the test pipe ran an average of 105.4HP/93.9TQ keep in mind this car is different from ours and all engines run different they didn't state how many miles are on the Miata but I would assume that a high flow cat would make a difference of about +.5HP but I could be wrong. I would also like to see someone do this with 3 Alero's one for each engine size.

I say a universal cat is a stock cat that is meant to be welded to any car, and that it is inferior to a true high flow cat, but I guess some companies would name their "universal cat" as a "high flow universal cat" which screws all my ideas :lol:

Well, one thing is for damn sure, and that is that the cat does not add hp. It adds resistance therefore a power loss.

Well put. For engines that are stock or only slightly modified, changing the cat will make only a minimal difference. As you start adding more power (i.e. supercharger/turbo), it becomes more important to increase flow in the exhaust system.

My F150 has 4 cats, two per side. Now thats restrictive. They are all coming off soon and will be replaced with 2 Bassani hi-flows.

Guess why I don't have a cat on my car..... but I have two straight thru mufflers one magnaflow in the back and one borla where the cat is supposed to be

But.. but.. what about the environment? lol

There are no emission laws up here in Canada.

We get E-tested just for fun. We're cool like that.

There are. If he gets caught by a cop and that he checks under the car and see no Cats, he will probly ask for an inspection, and that wont pass.

the only thing he will see is a muffler that looks like a cat and that is at the place of the original cat... so I doubt that there will be a problem with that... And I'm getting my car evaluated and inspected this summer.. If a cop try to give me an exhaust ticket or anything else I will slap him in the face with the paper of the inspection that proves that my car is 100% legal

but how can your car pass the inspection with no cat? I mean the guy at the inspection wont just go "Hmmm that looks like a catalytic converter right there, no need to test the fumes from the exhaust! I really wonder what makes that car sound so loud!" lolol

Not to mention the different odor of fuel a car without a cat has.

Not that I passed any inspection, but I would logically think that its not only a visual inspection, that would be useles... :lol:

well as far as I know there aren't any in Alberta, but I'll find out for sure though.

I passed inspection for the car of my G/F today and they did not even removes the wheels to checks the brakes, it took like 25 minutes and it was a real joke..... it's 85$ and I talked to the guy all the time that he did the inspection, they passed a subaru sti with 3 inch straight exhaust with no problem just before me.... lol