Cats

[Dcmaro28]

I'm not talkin about the animal lol but do you guys think there would be enough gain to justify cutting them off?

[JoshBobGuptaMarley]

I'm thinking you have to do a tune if you want to do it or you will throw cels left and right. Living in a small town in Florida I've considered it since we don't do inspections....I think the tune is what stopped me.

[scrming]

Cats.... so many cats... so few recipes... LOL!


Cats... as far as the emissions devices.... you will DRAMATICALLY change the sound of your car if you remove them... and it may NOT be for the better...

[OOLIE]

I don't think you will get much of a gain unless you are pairing it up with some headers or something. At that point you may get a little more out of the headers, but I wouldn't do it on a stock set up. JMO

[baby02]

You will gain interior noise and exhaust smell.

[The Stig]

You won't see any gains by going catless until your your 500-600+ rwhp

[scrming]

Originally Posted by stieger

You won't see any gains by going catless until your your 500-600+ rwhp

I would disagree... there should be some gains... i mean look:



There are some nice mid-range gains to be had with long tubes... I think some of that comes from going from the above to a single HFC...

[SC2150]

Hmmmm....me like kats....taste like chiken!

There are gains for sure but will not pass emmissions.

[bmorecam]

Originally Posted by scrming

I would disagree... there should be some gains... i mean look:



There are some nice mid-range gains to be had with long tubes... I think some of that comes from going from the above to a single HFC...

Originally Posted by SC2150

Hmmmm....me like kats....taste like chiken!

There are gains for sure but will not pass emmissions.

This is something that I never understood. I wonder why some peoples think there's no gains to be had by removing the cats. I've heard this before lots of times on this v6 board. It might be bad for emission no question about it but removing the restriction closer to the head will always give a few more horses. It's called better scavenging.

[Amarr014]

im removing mine very shortly, already got the o2 sensors tuned out

[Ventmaster]

A "few more horses" does not justify the removal of your catalytic converters. Modern vehicles are actually fed a richer mixture of fuel to improve Cat efficiency. The "restriction" has often been tuned to create the appropriate backpressure needed for the surprisingly large amount of torque our little 217 cubic inch engines provide, and the restriction is miniscule compaired to the original cats.

Its like saying the computer you're looking at right now is just like the ones used in 1974 (1st year of unleaded gas and the "cat").

Too often a little more noise is mistaken for power-and very often just the opposite is the case. I'd bet $100 bucks right now if you make no mods to a modern Camaro and just cut off the cats you'll do nothing but make noise, smell like raw gas, have a check engine light to look at, and LOSE power.

IMHO, of course...

[Amarr014]

i should be looking at a few extra horses with the removal of mine on top of my current mods and i have my o2 sensors tuned out so i wont throw a code.

[OOLIE]

Originally Posted by Ventmaster

A "few more horses" does not justify the removal of your catalytic converters. Modern vehicles are actually fed a richer mixture of fuel to improve Cat efficiency. The "restriction" has often been tuned to create the appropriate backpressure needed for the surprisingly large amount of torque our little 217 cubic inch engines provide, and the restriction is miniscule compaired to the original cats.

Its like saying the computer you're looking at right now is just like the ones used in 1974 (1st year of unleaded gas and the "cat").

Too often a little more noise is mistaken for power-and very often just the opposite is the case. I'd bet $100 bucks right now if you make no mods to a modern Camaro and just cut off the cats you'll do nothing but make noise, smell like raw gas, have a check engine light to look at, and LOSE power.

IMHO, of course...

I think that is a good argument to be honest. I have been following this and I understand the cats have been really improved as far as not hurting HP. I would love to see that test you want as I am very curious. I am curious as you said NO mods, so could that change without being stock or is it NO moding in conjunction with the cat removal, like headers at the same time? (before and after dyno's)

My thoughts are if you are modding it kinda changes things in the tune and therefore the extra flow could help. IDK I am just trying to understand.

[The Stig]

You don't have to believe me but JRE did a test and found maybe a 5 rwhp difference. Just saying. Hopefully Ted will chime in here at some point to back me up. Oh also, when you run catless you are at risk of being fined $1,500 (I think that's right, but need to double check).