Kooks Green vs HO Green vs Ultra Green vs competition vs catless

[cbrtrx]

Oem cats definitely will fail over time with boost. Sometimes they can take out the engine in the process. The factory warranty may replace your cats but is not going to replace your engine.

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[GrabberBargeCaptain]

I wouldn't recommend catless here. You will get pulled over at some point and at some point you WILL meet a CHP officer wanting to ruin your day and make you pop your hood. Happened to me before and i wasn't even modded at the time. They basically don't need any training to fuck up your day and finances. All they need to do is SUSPECT you of having tampered with emissions equipment.

Also, it sounds like shit.

 

[5doorsoffury]

e85 makes catless smell ok fwiw. sound well id stick with oem res and mufflers. boost forced my hand with cats but volume is loud. if there not from the car world you might have issues with neighbor's. 93 smells like shit , e85 is yummy and the oem suitcase res and a pricy axe back will do you good. its so subjective when it comes to sound i would be bull shitting you if i told u what sounded good with out a imho.

 

[Prodigal]

Love my Kooks long tubes with GESI Green cats. Buy once, cry once.

 

[stang17]

I have a 2.9 whipple Kooks 1 7/8 into a 3inch AWE Touring cat back.

Running stock whipple tune melted my OEM cats within first few thousand miles (boosted by dealer from day 1 and wrapped into 72 month 0% financing).

I had labor to replace them covered under warranty and was able to purchase the Kooks headers and high flow cats (non green) and have dealer install them no cost to me.

Running same whipple tune and pulley, those cats failed in less than 700 miles. Both times I was lucky enough to notice the sulfur smell and get them pulled before raising/breaking a ringland from backpressure.

Not financially able to get green cats at that time I ran free flow and made 786 whp SAE.
Free.flow introduced a raspy exhaust note and when running 93 octane car stunk. Literally anything in my trunk would get perfumed with exhaust fumes.

I ended up buying the bullet and ordering the GESI Gen 2 G sport series cats from Kooks (they label them as either the HO or Ultra Green cats). They took the raspiness note out of the exhaust and dramatically reduced the 93 fumes. No check engine light either.

I dynoed same tune, same pulley, and car made 819 whp std, which with correction is 786 whp SAE. Literally no difference in power.

If you run cats, make sure cat protection is turned on within tune and DO NOT USE A 2-STEP OR ANY ANTILAG as those will pretty much wipe out any cat.

You can always vband the connections to make swapping free flow to catted quickly and easy for track days where you would be using a a 2 step, etc.

 

[beefcake]

there is no cat that is carb legal in california, and we nor just about any dealer will send a header, cai, oil separator to cali because of carb

 

[robvas]

I have a 2.9 whipple Kooks 1 7/8 into a 3inch AWE Touring cat back.

Running stock whipple tune melted my OEM cats within first few thousand miles (boosted by dealer from day 1 and wrapped into 72 month 0% financing).

I had labor to replace them covered under warranty and was able to purchase the Kooks headers and high flow cats (non green) and have dealer install them no cost to me.

Running same whipple tune and pulley, those cats failed in less than 700 miles. Both times I was lucky enough to notice the sulfur smell and get them pulled before raising/breaking a ringland from backpressure.

Not financially able to get green cats at that time I ran free flow and made 786 whp SAE.
Free.flow introduced a raspy exhaust note and when running 93 octane car stunk. Literally anything in my trunk would get perfumed with exhaust fumes.

I ended up buying the bullet and ordering the GESI Gen 2 G sport series cats from Kooks (they label them as either the HO or Ultra Green cats). They took the raspiness note out of the exhaust and dramatically reduced the 93 fumes. No check engine light either.

I dynoed same tune, same pulley, and car made 819 whp std, which with correction is 786 whp SAE. Literally no difference in power.

If you run cats, make sure cat protection is turned on within tune and DO NOT USE A 2-STEP OR ANY ANTILAG as those will pretty much wipe out any cat.

You can always vband the connections to make swapping free flow to catted quickly and easy for track days where you would be using a a 2 step, etc.

What pulley and tune were you making those numbers with? I don't remember those kids making anywhere near that

 

[stang17]

https://www.mustang6g.com/forums/threads/before-you-dyno-a-whipple-tune-car.103976/

 

[JL5.0]

I have a 2.9 whipple Kooks 1 7/8 into a 3inch AWE Touring cat back.

Running stock whipple tune melted my OEM cats within first few thousand miles (boosted by dealer from day 1 and wrapped into 72 month 0% financing).

I had labor to replace them covered under warranty and was able to purchase the Kooks headers and high flow cats (non green) and have dealer install them no cost to me.

Running same whipple tune and pulley, those cats failed in less than 700 miles. Both times I was lucky enough to notice the sulfur smell and get them pulled before raising/breaking a ringland from backpressure.

Not financially able to get green cats at that time I ran free flow and made 786 whp SAE.
Free.flow introduced a raspy exhaust note and when running 93 octane car stunk. Literally anything in my trunk would get perfumed with exhaust fumes.

I ended up buying the bullet and ordering the GESI Gen 2 G sport series cats from Kooks (they label them as either the HO or Ultra Green cats). They took the raspiness note out of the exhaust and dramatically reduced the 93 fumes. No check engine light either.

I dynoed same tune, same pulley, and car made 819 whp std, which with correction is 786 whp SAE. Literally no difference in power.

If you run cats, make sure cat protection is turned on within tune and DO NOT USE A 2-STEP OR ANY ANTILAG as those will pretty much wipe out any cat.

You can always vband the connections to make swapping free flow to catted quickly and easy for track days where you would be using a a 2 step, etc.

Do the HO cats fit? I heard only 4 inch body fit and the HO's are 4 1/2

 

[stang17]

Do the HO cats fit? I heard only 4 inch body fit and the HO's are 4 1/2

These are the ones that I have that were rated for 750 hp per cylinder bank. Kooks 1 7/8, into these, into AWE touring cat back. Not fitment issues.

 

[stang17]

Do the HO cats fit? I heard only 4 inch body fit and the HO's are 4 1/2

Here's what the exhaust sounds like.
COT on, e74 in tank running PCMTEC canbus flex fuel tune 21.5 timing with 3.3 pulley, 3.31 rear gear, 4th gear to keep speed down.

Made 797 whp SAE uncorrected and 773 corrected.

 

[JL5.0]

These are the ones that I have that were rated for 750 hp per cylinder bank. Kooks 1 7/8, into these, into AWE touring cat back. Not fitment issues.

People have said they fit running

These are the ones that I have that were rated for 750 hp per cylinder bank. Kooks 1 7/8, into these, into AWE touring cat back. Not fitment issues.

so this setup is what you have?

 

[JL5.0]

People have said they fit running
so this setup is what you have?

or did you have the gesi non kooks branded ho cats custom welded on kooks offroad pipes?

 

[stang17]

or did you have the gesi non kooks branded ho cats custom welded on kooks offroad pipes?

They are essentially what I got. I originally ordered the Kooks 1 7/8 with the regular non green high flow cats. Once they failed in less than a thousand miles, I had just ran them gutted. Eventually just reordered from Kooks the HO Green that would have nor ly come with the kit you are looking at.

 

[JL5.0]

They are essentially what I got. I originally ordered the Kooks 1 7/8 with the regular non green high flow cats. Once they failed in less than a thousand miles, I had just ran them gutted. Eventually just reordered from Kooks the HO Green that would have nor ly come with the kit you are looking at.

Cool, I appreciate your help

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