High flow catalytic converter

[crownvic31]

Hello all

I am getting ready to install my texas speed engineering long tube headers on my 07 escalade. All I need is a pair of high flow cats as I do need to pass emissions in my state.

Any recommandations? brand, part #?

Thanks in advance

 

[iamdub]

Lol
Texas Speed + Speed Engineering?

They're all "high-flow". It's the style that's been used for decades. OEM is best- can you just have your originals cut out and welded into your new exhaust somewhere? If you need smaller ones, it's kind of a crapshoot with aftermarket. @swathdiver seems to have a great experience with his Magnaflow cats. I think the bullet style ones in the Kooks or American Racing long tubes are good, too. But, really expensive.

 

[swathdiver]

Hello all

I am getting ready to install my texas speed engineering long tube headers on my 07 escalade. All I need is a pair of high flow cats as I do need to pass emissions in my state.

Any recommandations? brand, part #?

Thanks in advance

If I were buying long tube headers and wanted cats, I would buy the y-pipe with cats from the header manufacture to make things fit seamless and simple. I think it's a can of worms when you go trying to piece together a catted y-pipe with long tubes. Done wrong, you can negate what you were shooting for, more horsepower.

 

[crownvic31]

@swathdiver
Bought the Texas speed headers used with the catless y-pipe for $100. I just need to have my guy weld in some cats. My OEM cats are done hence why I'm going to replace my exhaust manifolds. I was looking at the magnaflow bullets and also the flowmasters. They have several ones though. Just figured I'd ask and see whats being used

 

[mikeyss]

I have American Racing long tube headers, and they came with their y pipe and converters. I used that set up, but chopped the 'y' off since I have true duals. I failed emissions BADLY with their cats, so I bought the magnaflow California emissions spec cats and passed emissions test with flying colors. Best of all, I haven't experienced any power loss, and it quieted my exhaust down a bit - something I wanted anyhow.

 

[crownvic31]

I have American Racing long tube headers, and they came with their y pipe and converters. I used that set up, but chopped the 'y' off since I have true duals. I failed emissions BADLY with their cats, so I bought the magnaflow California emissions spec cats and passed emissions test with flying colors. Best of all, I haven't experienced any power loss, and it quieted my exhaust down a bit - something I wanted anyhow.

Good to know. Which magnaflows did you buy? Remember model #?

 

[mikeyss]

The price must have recently went up, I only paid $190 each

 

[crownvic31]

@mikeyss Thank you sir. While these wont work for my set up because they are to big, but atleast i know i can count on magnaflow. I will be going with magnaflows 54959 spun cat.

 

[Charlie207]

3" Catalytic Converter O2 High Flow for Late Models - Federal Emissions

Wholesale warehouse for performance and OE exhaust systems and components.

performance-curve.com

I've bought stuff from them over the last 15 years or so, and have had good luck with their cats previous cars.

 

[992dr]

Magnaflow 59959 Metallic Spun catalytic converter.
Have used these for several vehicles and they are great.
I'm actually getting ready to use them on my 07.

 

[crownvic31]

Magnaflow 59959 Metallic Spun catalytic converter.
Have used these for several vehicles and they are great.
I'm actually getting ready to use them on my 07.

What set up are you running? Long tubes? Do you require state inspection?

 

[crownvic31]

3" Catalytic Converter O2 High Flow for Late Models - Federal Emissions

Wholesale warehouse for performance and OE exhaust systems and components.

performance-curve.com

I've bought stuff from them over the last 15 years or so, and have had good luck with their cats previous cars.

I like the fact that the o2 bung is already on there. Another option here. Ive been holding off with buying the cats as im still looking for reviews.

 

[Charlie207]

I like the fact that the o2 bung is already on there. Another option here. Ive been holding off with buying the cats as im still looking for reviews.

I'd love to get a couple of these cats, and a set of headers from Speed Engineering, and see if it would work, but I doubt it'd fit in a 4wd chassis.

 

[crownvic31]

I'd love to get a couple of these cats, and a set of headers from Speed Engineering, and see if it would work, but I doubt it'd fit in a 4wd chassis.

Why wouldnt it fit?
My long tubes are going on a 4wd escalade. My mechanic will have to cut the y pipe of course to place in the cats. I dont see this being that difficult

 

[Charlie207]

Why wouldnt it fit?
My long tubes are going on a 4wd escalade. My mechanic will have to cut the y pipe of course to place in the cats. I dont see this being that difficult

No basis, I know plenty of 4wd have long-tubes, I'm just assuming it'd be a huge PITA for me to do it.

 

[crownvic31]

Does the distance between the o2 sensors and cat matter?

 

[Charlie207]

Does the distance between the o2 sensors and cat matter?

Great question. I don't know.

 

[992dr]

What set up are you running? Long tubes? Do you require state inspection?

My previous 2dr had Thorley Tri-Y headers and maggy cats.
Yes, I do require them. And they have to be in the stock location, though, I think this has changed recently but still need to have cats. And personally, I like how they sound. Unfortunately, these will be going on my stock manifolds on my 07 but I will be making a new Y-pipe and exhaust all out of 3" stainless.
I had turned down a 59956 cat which is originally 2.5" to a 3" to fit with LT headers because of the space it shortened the cat to almost 6".


I try to keep the O2 as close to the factory location as possible when necessary, otherwise you can get extension for them.

 

[992dr]

Forgot to post the pic of the cat haha

 

[iamdub]

Does the distance between the o2 sensors and cat matter?

I'd try to keep it as relevant to the OEM setup as possible. This includes the location of the cat, itself. The cat can't be too far downstream or it won't get hot enough to properly catalyze the exhaust and it'll soot up and clog.