cats or no cats

[jmast27]

I just recently purchased a 2013 reg cab hemi and installed a super 40 flowmaster with turndowns. I was wondering if I will get more sound if I cut off my cats

 

[Diminus]

More sound but a good dose of fumes aswell, have you considered a high flow cat, less restrictive and probably help u develope a better exhaust note

 

[UNBROKEN]

You're gonna run the risk of a high dollar ticket without cats if you run into "that" cop, not to mention not passing any inspection if your state has it. Cats are a federal thing...your local laws don't matter. They flow so good these days there's zero performance gain from ditching them.
If you want more sound...ditch the POS Flowmaster and just straight pipe it. That Flowmaster probably cost you power anyway.

 

[Bully's Performance]

I agree with this ^^^

 

[loveracing1988]

Yeah, I hate it when people get rid of cats, especially now a days, even if they coat you 5hp,are you really going to notice it? If you are really going for just sound you could always put a cutout in so you can have the sound when you want it but for cruising you can have a exhaust so you don't get tired of driving on long trips listening to the drone and the mds kick in and out.

 

[Adams2013]

IMO no cats

 

[loveracing1988]

IMO no cats

Explain please.

 

[Etroze86]

Computers like cats unless you are tuning without them leave them in your truck will be happier that way.

 

[UNBROKEN]

IMO no cats

Don't take this the wrong way...but with all the questions you ask and the fact that you're still learning 99% of this stuff yourself you're in no position to give advice like that. Especially just a blanket statement with nothing to back it up.
If you wanna tear up your own truck, that's fine. Just don't give "advice" you're not qualified to give. You may cause someone to harm their own truck in the process.

 

[TheSatinPumpkin]

Warranty alone i would leave them in place since gotta deal with the mil.

Sent from my ASUS Transformer Pad TF700T using Tapatalk 2

 

[audio1der]

Wouldn't the next step in the quest for more sound be to lose the resonators?

 

[WhiteExpress]

The potential fines for tampering with a federal emissions system for... a bit more sound and virtually no performance gain? No thank you.

Keep your cats, move on to other things.

 

[Adams2013]

Don't take this the wrong way...but with all the questions you ask and the fact that you're still learning 99% of this stuff yourself you're in no position to give advice like that. Especially just a blanket statement with nothing to back it up.
If you wanna tear up your own truck, that's fine. Just don't give "advice" you're not qualified to give. You may cause someone to harm their own truck in the process.

Won't take nothing personal... But I've seen my buddies ram my brothers ram
Run 10x better with no cats for perfoamce wise your correct I have not done this to my truck and I am learning about Alot of stuff but I've seen my brothers crew cab in the 1/4 mile run bone stock with cats at a 15.3
Run again 1 week later with no cats and ran a 14.9
In the same conditions... My buddy's ram in ca with mods ran a 14.5 removed cats and ran a 14.1 so I have seen proof that removing cats work
Yes I agree that the check engine light comes on truck runs rich and yes Warrenty is avoided...and yes no cats is very bad in the long run
But I have seen good Resaults...so when the op asked cats or no cats I'd Assume that be wanted performance and no cats is a win lose situation
But I've seen nothing but good Resaults with them off they remove Alot of Restriction and I do Know for sure having headers with no cats is a big gain

 

[Hemi450hp]

I gained 8hp on my 03 when I removed the cat. That was not a daily driven truck though, so it wasn't as hard on me as it would be for a daily driver. The truck will get considerably louder, have more of a pop to the exhaust tone, you are going to smell fuel all the time, inspections will be hard to get (I used to have to pay a guy $150 to "let it slide"), and then your warranty is obviously gone. It is fine for some guys, but if you plan to keep it a daily driver, I would just leave the cats alone. If you want more sound, then lose the resonators and look into a set of headers. The longtubes will come with a Y-pipe that includes new high flow cats.

 

[UNBROKEN]

Won't take nothing personal... But I've seen my buddies ram my brothers ram
Run 10x better with no cats for perfoamce wise your correct I have not done this to my truck and I am learning about Alot of stuff but I've seen my brothers crew cab in the 1/4 mile run bone stock with cats at a 15.3
Run again 1 week later with no cats and ran a 14.9
In the same conditions... My buddy's ram in ca with mods ran a 14.5 removed cats and ran a 14.1 so I have seen proof that removing cats work
Yes I agree that the check engine light comes on truck runs rich and yes Warrenty is avoided...and yes no cats is very bad in the long run
But I have seen good Resaults...so when the op asked cats or no cats I'd Assume that be wanted performance and no cats is a win lose situation
But I've seen nothing but good Resaults with them off they remove Alot of Restriction and I do Know for sure having headers with no cats is a big gain

There's no way simply removing the cats resulted in a .4 second quicker 1/4 mile time. It's not physically possible....period.
That would mean at minimum a net gain of 20 HP at the wheels. Modern cats at most flow 2-3% less than an open pipe. That does not and can not equal 20 net HP.
Anything from amount of fuel in the tank to weather that night could account for those differences in times.

Here's a deal you can't pass up if you're so sure.

Go dyno your truck as it sits...then remove the cats and dyno it again the very same day.
I'll pay for the dyno time. You post the results. If you pick up 20 or more HP I'll throw you another 200 bucks for your trouble. If you pick up less you reimburse me for the dyno time.

Deal?

 

[wickedwhite2012]

Lose bottom end alot of the time. You need some type of back pressure. You do gain it back on top alot of the time tho. Correct me if I am wrong.

 

[wickedwhite2012]

There's no way simply removing the cats resulted in a .4 second quicker 1/4 mile time. It's not physically possible....period.
That would mean at minimum a net gain of 20 HP at the wheels. Modern cats at most flow 2-3% less than an open pipe. That does not and can not equal 20 net HP.
Anything from amount of fuel in the tank to weather that night could account for those differences in times.

Here's a deal you can't pass up if you're so sure.

Go dyno your truck as it sits...then remove the cats and dyno it again the very same day.
I'll pay for the dyno time. You post the results. If you pick up 20 or more HP I'll throw you another 200 bucks for your trouble. If you pick up less you reimburse me for the dyno time.

Deal?

Ill even jump in on that deal to. The only thing you will gain is that loud drone in the truck. In a daily driver that gets old.

 

[Adams2013]

There's no way simply removing the cats resulted in a .4 second quicker 1/4 mile time. It's not physically possible....period.
That would mean at minimum a net gain of 20 HP at the wheels. Modern cats at most flow 2-3% less than an open pipe. That does not and can not equal 20 net HP.
Anything from amount of fuel in the tank to weather that night could account for those differences in times.

Here's a deal you can't pass up if you're so sure.

Go dyno your truck as it sits...then remove the cats and dyno it again the very same day.
I'll pay for the dyno time. You post the results. If you pick up 20 or more HP I'll throw you another 200 bucks for your trouble. If you pick up less you reimburse me for the dyno time.

#1 I don't Need your money
#2 I'm not stupid I no what I seen I Was There When Both Trucks Ran
My brothers truck at firebird race way phx az
And my buddy's truck at irwendale race way La California
#3 your 200 ain't worth my Warrenty
#4 it's not always The Hp Gained That's Make You Faster The Weather And Condition Makes A Huge Difference but I Probably don't gotta tell you that
But I know what I seen and I knew what was done to both trucks and if I was not a witness I would of not belived it myself but I was in person at the track
So I have to choice but to Belive it

 

[WhiteExpress]

In Before The Lock!

 

[UNBROKEN]

#1 I don't Need your money
Not offering you money...just trying to make it worth your time
#2 I'm not stupid I no what I seen I Was There When Both Trucks Ran
My brothers truck at firebird race way phx az
And my buddy's truck at irwendale race way La California
Not saying you didn't see it, just saying it wasn't based on simply removing the cats
#3 your 200 ain't worth my Warrenty
Then why did you suggest another member here kill his warranty?
#4 it's not always The Hp Gained That's Make You Faster The Weather And Condition Makes A Huge Difference but I Probably don't gotta tell you that
But I know what I seen and I knew what was done to both trucks and if I was not a witness I would of not belived it myself but I was in person at the track
Then why did you imply, again, in your #2 that the cats made all the difference?
So I have to choice but to Belive it

Believe what? That the cats made the difference or that weather/track conditions/etc. made the difference?