Thinking about deleting cats.

Ram6169 · Mar 23, 2016

Good evening everybody, I'm thinking about taking my cats off my 2013 5.7. I've already got the custom hemifever tune and a super 10. What are some pros and cons with doing this?

Thanks in advance

chris1965 · Mar 23, 2016

Con: when they get you, it will cost you the same as putting the v10 in it, what would be a better choice.

GP4L · Mar 23, 2016

Ram6169 said:
Good evening everybody, I'm thinking about taking my cats off my 2013 5.7. I've already got the custom hemifever tune and a super 10. What are some pros and cons with doing this?

Thanks in advance

Less back pressure - shifts the power curve to the right. You might feel like your truck lost a little bit of bottom end TQ. Tuning and proper headers will probably rectify that. As long as your tuner will shut off the trouble codes that your ECU will throw, there's really no other cons besides actual emissions going up.

Pro's: less weight, and capable of more exhaust flow (higher power output potential).

Exhaust will be louder too (could be a pro or con, personal preference).

You'll likely face some sort of major fine if you're *actually* caught with disabled emissions control devices.

Hemi450hp · Mar 23, 2016

Removing cats will get you about 8hp/tq to the wheels. The exhaust is going to be a good bit louder, and you will smell fuel through the exhaust. Hemifever will take care of any engine lights in the dash, but if your inspection shop does a visual inspection, they can fail you for not having cats on the truck.

Ram6169 · Mar 23, 2016

Hemi450hp said:
Removing cats will get you about 8hp/tq to the wheels. The exhaust is going to be a good bit louder, and you will smell fuel through the exhaust. Hemifever will take care of any engine lights in the dash, but if your inspection shop does a visual inspection, they can fail you for not having cats on the truck.

So I took them off and immeadiaty regret my decision, sounds horrible, when it hits a high RPM is all broken up and popping. Putting them back on asap

GP4L · Mar 23, 2016

CMil527 · Mar 23, 2016

so with no tune is it as simple as o2 sims?

doz · Mar 23, 2016

Ram6169 said:
So I took them off and immeadiaty regret my decision, sounds horrible, when it hits a high RPM is all broken up and popping. Putting them back on asap

What do you have done to your exhaust?

I know I had ARH LT on my old truck, no cats, and Magnaflow cat-back 16869 (or whatever) and it sounded killer. No drone to speak of. Worst part was a louder tick, but not unbearable.

Kotta390 · Mar 23, 2016

With a super 10, it's like almost having straight pipe IIRC

Ram6169 · Mar 23, 2016

doz said:
What do you have done to your exhaust?

I know I had ARH LT on my old truck, no cats, and Magnaflow cat-back 16869 (or whatever) and it sounded killer. No drone to speak of. Worst part was a louder tick, but not unbearable.

I just have the super 10, it almost sounds like a baby rattle is in there when I stomp on it. Thinking about some high flow cats.

doz · Mar 23, 2016

Ram6169 said:
I just have the super 10, it almost sounds like a baby rattle is in there when I stomp on it. Thinking about some high flow cats.

Thats why. The Super10. IMO, flowmasters sound like ass with anything done exhaust related. I personally do not like FM at all on the Hemi but thats just me.

Statcher1 · Mar 23, 2016

doz said:
Thats why. The Super10. IMO, flowmasters sound like ass with anything done exhaust related. I personally do not like FM at all on the Hemi but thats just me.

Agreed. I had the Cherrybomb equivalent of that muffler on my truck. And I liked it right up until I done the Longtubes with no cats. Once I did that set-up. It sounded like mortal hell. I regretted doing the Longtubes into I could get the Magnaflow 14" installed.

Sent from the Rocket in my Pocket

Hemi450hp · Mar 23, 2016

High flow cats really aren't worth the money unless you are getting them with a set of longtubes. If you don't like it without cats, I would just throw the stock cats back on.

Thinking about deleting cats.

Ram6169

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