Gutting the cats

[DIB15]

Be it one of our cats is welded to the manifold, that makes LT's our only readily available form of cat deletes. Has anyone tried gutting the cats without the removal of the manifold? I know myself and one other owner want to do this. We are both lund tuned so we will be tuned for it.

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[Grimace427]

I would rather cut the pipe and allow it to be clamped back on later should I want to return the car to stock, than destroy the very expensive cats just for a few HP.

 

[badass03ragtop]

Agree with Grimace here as I have made the mistake of gutting cats and getting caught on a sniffer. Had to pay quite a bit to have new cats welded back on, but I had them welded to a new piece of pipe that could be swapped on and off with a few good quality clamps. Still beat the hell out of the federal fine I was facing though....

For those who haven't looked at it yet, this is what he is talking about:

What the heck??? Pic is on SVTperformace.com

 

[DIB15]

Agree with Grimace here as I have made the mistake of gutting cats and getting caught on a sniffer. Had to pay quite a bit to have new cats welded back on, but I had them welded to a new piece of pipe that could be swapped on and off with a few good quality clamps. Still beat the hell out of the federal fine I was facing though....

Im in texas we dont have codes for emissions..... SO

 

[Barrel]

Im in texas we dont have codes for emissions..... SO

While this is true, technically you're still violating federal laws. Enforcement is non-existant but you could still be facing fines and penalties if someone were determined enough.

 

[badass03ragtop]

Im in texas we dont have codes for emissions..... SO

I'm not trying to argue here, just educate, in case you are unaware, but it is a federal law, and here is an excerpt from the Texas Commision on Environmental Quality:

Tampering is removing or making inoperable any system or device used to control emissions from a motor vehicle engine. The motor vehicle is defined as any self-propelled vehicle designed for transporting persons or property on a street or highway. The only exception to the tampering rule is the need to install a new certified emission control system or device that is equally effective in reducing vehicle emissions.
Tampering may include, but is not limited to:

• Removing the catalytic converter, air pump, and exhaust gas recirculation (EGR) valve, or doing anything to keep them from working properly, such as disconnecting vacuum lines and electrical or mechanical parts of the pollution control system.
• Adjusting any element of a car or truck's emission control design so that it no longer meets the manufacturer's specifications.
• Installing a replacement part that is not the same in design and function as the part that was originally on the vehicle.
• Adding a part that was not originally certified on the car, such as installing a turbocharger.

The U.S. Environmental Protection Agency's (EPA) anti-tampering enforcement policy is covered under the provisions of Mobile Source Enforcement Memorandum No. 1A[13].[14] This policy states that the EPA will not consider any modification to a certified configuration to be a violation of federal law if there is a reasonable basis that emissions are not adversely affected. A certified configuration is an engine or engine-chassis design that has been certified or approved by the EPA to meet certain emission standards prior to the production of vehicles with that specific design. Evidence of federally approved testing must be available upon request.

Bottom line is, I don't know anyone who's done it on a '15, but I do know many who have done it on other Mustangs. You may have to be the first and share your experience. Good luck

 

[Need4Speed15]

Be it one of our cats is welded to the manifold, that makes LT's our only readily available form of cat deletes. Has anyone tried gutting the cats without the removal of the manifold? I know myself and one other owner want to do this. We are both lund tuned so we will be tuned for it.

I have a great alternative for you...check out my for sale thread:
http://www.mustang6g.com/forums/showthread.php?t=18043

This way you can keep your stock stuff incase you need to put it back on later. Also this set-up can be installed in about 90 minutes and the install is easy.

Want to move this set-up so make me an offer!

 

[Reds197]

Gutting the cats is worth at very most 2 hp on a tuned coyote. Not worth the time. An offroad is a much better option.

 

[Nick@JDM]

Leave your cats there. Your car will "feel" better with them. That back pressure provides more part throttle torque from the increased cylinder pressure. Removing the cats is only good for wide open throttle power IMO. I had an off-road setup on my Mustang and it made great WOT power...but when driving part throttle like you do for daily driving it felt like it lost power. After putting the cats back on it felt much better.

These are the kind of things you have to drive and feel. No one really measures part throttle power on a dyno.

 

[DIB15]

Leave your cats there. Your car will "feel" better with them. That back pressure provides more part throttle torque from the increased cylinder pressure. Removing the cats is only good for wide open throttle power IMO. I had an off-road setup on my Mustang and it made great WOT power...but when driving part throttle like you do for daily driving it felt like it lost power. After putting the cats back on it felt much better.

These are the kind of things you have to drive and feel. No one really measures part throttle power on a dyno.

My truck? Hmm... well you're missing the point by alot...

 

[DIB15]

Gutting the cats is worth at very most 2 hp on a tuned coyote. Not worth the time. An offroad is a much better option.

Do you understand gutting them is the same as an offroad pipe?

 

[Reds197]

Do you understand gutting them is the same as an offroad pipe?

No its not. You will create turbulence inside the cat housing. It is a waste of time on the 5.0.

 

[Nick@JDM]

My truck? Hmm... well you're missing the point by alot...

Man I thought I edited that quick enough! :headbonk:

 

[badass03ragtop]

Gutting the cats is worth at very most 2 hp on a tuned coyote. Not worth the time. An offroad is a much better option.

Maybe not even that. From what I have read, the Mani-cat, as that one is called, is supposed to have the same restriction as straight pipe.... More from the bends in the tubing down stream than that cat.

 

[DIB15]

Maybe not even that. From what I have read, the Mani-cat, as that one is called, is supposed to have the same restriction as straight pipe.... More from the bends in the tubing down stream than that cat.

With your theory, and it is that, a theory, because offroad midpipes have been dyno proven to add power.... Would mean just that, the dyno and tuning results were null and void... But nevertheless they are proven facts..

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