CAT Failed..

[Tongan310]

Alright so I had my cat failed or more like it turned into a giant plug.. Cut it out and well now I got straight pipe hell that's a lot louder than I thought it'd be... (truck is happy though cause it runs way better now..)

So the question is as anyone used High Flow cats on these trucks? I got a 97 c3500 with 7.4. I have an cat back exhaust so I have to buy and weld in the new cats...

I was looking at these.. but not sure if they will work. (I'll make the computer happy I'm more worried about high flow.)

https://www.amazon.com/Flowmaster-2...&qid=1493608570&sr=8-2&keywords=High+Flow+cat

 

[Jorge6.5]

I just put these on my truck.https://www.amazon.com/gp/aw/d/B01MU2KVVJ/ref=yo_ii_img?ie=UTF8&psc=1

After redoing my exhaust I removed the cats and went with a straight through muffler. Sounded great but the exhaust really stunk. Hence the need for those cats. They really quiet down the exhaust

 

[Tongan310]

How long have you had it? I'm afraid one of these are like only going to last 500 miles or something stupid.

 

[df2x4]

If you're worried about it you could always just fork over the cash for the Magnaflow direct fit intermediate pipes with cats. I used the V6 Y-pipe from them on my red truck, it's a much nicer piece than the factory intermediate pipe. Just checked their website and they make direct fit cats for the 454 trucks.

 

[90halfton]

Are you in a emission state? If not, scrap it.

 

[Jorge6.5]

How long have you had it? I'm afraid one of these are like only going to last 500 miles or something stupid.

Actually only been a week. The exhaust isn't nearly as stinky. Have to rack up more miles to see how they hold up for the long run

 

[Tongan310]

Well I went with the Flowmasters CATS. Waiting on the muffler to come in now but after ordering a 2.5 cat and muffler I received a 2.25 muffler and a 3inch cat. Is the exhaust shop gonna give me a headache for this? ( should I send this back? I don't really mind if its not that big of a deal)

On the performance side will this be an issue?

 

[Black_cirrus]

The 3" cat will be easy to deal with I wouldn't put a 2 1/4" muffler on any V8 though needs to be 2 1/2" but since you have 3" cats I'd put it in all 3" on a 7.4. I think The 2 1/4 muffler would be performance restrictive with the 7.4.

 

[Tongan310]

Well the muffler was for a big block atleast flowmaster says it is. (Flow masters 50 series ) with 2 2.25 inlet and a single 3" out. That's the only reason why I ask cause it seems fine its not like I'm Y piping to a 2.25. I already run 2 pipes all the way down to the muffler.

 

[Black_cirrus]

Two 2 1/4 makes more sense, it's ok as long as your not after max output. I couldn't tell you did the dual in single out. So I still wouldn't do it but I wouldn't hold it against you for it.