Cut my cats off today, went to shop and cried till they fixed up the exhaust pipes i messed up, now i think i need another muffler, the flowmaster seems like it doesnt even muffle anything!cant wait till i check it out at the strip and see if it helped my et, will post results. anybody else have results after cats removed?

 

sound clips

 

what does getting rid of ya Cats do? i was just wondering. has something to do with smog or emissions? ummm. just wondering

 

#1 makes your exhause sound so much better.
#2 adds more flow ( more hp )

not sure if it will help your ET, but i know you'll love the sound way more
:>

 

dont know how to post sound clips, here let me rev it and see if u can hear it! did u hear it? the neighbors sure did!

 

ok here in ontario, i dont know about the rest of Canada, we have to have emissions tests done every 2 years, well my 85 wiill only need one test to get it on the road, so after that i suppose i could take my cats off but im a not sure if i will coz they are on there for the environment so i wanted to know if it would be wrong to do that?

 

does it really sound alot better with out cats? what about high flow cats? Right now I got edelbrock headers, stock (I assume) dual cats, and a cut out in the rear, and I absolutly LOVE the sound with the cutout open.

wonder if it would sound even better with out the cats? Can you describe how it changes the sound? does it get deaper? Louder idle? more/less raspy? any gas milage change?

Just wondering, because I have pondered hacking them off.

 

I'm sure the cats do muffle the sound. If you ever cut one open you'll see why. The problem is they are the one emission requirement you can't pass smog with out and the first one a cop will look at if you ever get pulled over. You can run a gutted cat but a simple tapping on the case will give this away. It's a big A$$ fine too, somethin like $1200 and/or 6 months in jail.
If you remove your ERG or air injection er somethin, you can still get clean exhaust out the tail pipe if your car is in good tune, but regardless of how well your engine is running you can not pass without a cat.
If your running a 3" exhaust or bigger, removing a stock cat will get you 10-15 horsies and a high flow one only robs you about 5 hp. 92 heritage z28, I assume you removed the stock cats? If you didn't change anything else and you go to the same track where you can compare times, I would be shocked if you gained more than 2 tenths. But please do post your times, I'm curious.
What is your current best?

Here is the last problem than I'll shut up. I hate tree huggers just as much as the next gearhead but there are a lot of people who are highly worried about our environment. The EPA takes tests of the air in particular (US) areas. If the air is worse than their previous tests they have good grounds to impose stricter smog requirements. If everyone starts driving without cats THE AIR WILL GET WORSE. Just gives those guys more ammo when they talk to Congress about smog laws. If we do everything we can to keep the air clean they will have a much harder time getting those BS laws to pass.
Just seems like their are much better ways to gain 10 hp than scewing up the air and possibly getting in trouble with the law.
Besides a street legal 12 sec. car is way more impressive than an "off road" 12 sec. car.

 

BTW I forgot to mention. If your just after a higher ET. Put a cutout before the cat. Less piping to go through for the exhaust and no cat or muffler to run exhaust through. Street legal and makes your car sound like a dragster at the track.

 

my current best before cat cut is.035 reaction time, 14.512 at 94.35 quarter mile, with a stock 46000 mile 350 tpi with street tires, have done free mods and they have not done anything to help, so maybe this will help. i believe the cats were factory cats, but not sure, and as far as the sound goes, it is like a night and day difference.
Here in the midwest we dont have checks like alot of other states do, and have heard from reliable sources that cars older then 10 years will be exempt from the quidelines that newer cars will have.
Going to the track again thursday, so will post new times and numbers!

 

i took my cat off a couple of weeks ago and it sounded the same to me...