anyone make a high-flow cat for a 2004.5?

[Van Blom]

I've been reading up on the cat versus no cat forums and I was wondering if anyone makes a cat that flows better than the stock cat?

 

[ECappleman]

It's called a cat-delete pipe (or test pipe). :-laf

 

[jwilliams3]

5" resonator. :-laf

 

[nickleinonen]

in the first issue of diesel power [i still can't find the second issue ] there was an ad for magnaflow who is suppose to be coming out with high flow diesel cats in 3. 5", 4" and 5"... maybe contact magnaflow as last i was on their website, i didn't see anything about their diesel cats...

 

[Van Blom]

Thanks, nickleinonen, I'll look into it. You other two guys aren't much help, but what great senses of humor!!!

 

[ECappleman]

I know, but really... ...

Just take it off. They don't do emissions check on diesels. At least not here in Texas.

 

[Van Blom]

Well, Im going to replace the muffler and I hear that it gets pretty loud without the cat. Plus, in my county they test diesels for exhaust "opacity", what ever that is

 

[nickleinonen]

Plus, in my county they test diesels for exhaust "opacity", what ever that is

they basically load the engine up on a dyno [some mph value in specific gear] with a light sensor strapped across the exhaust outlet... they measure for how much light is lost... 0% is full light transfer, 100% is no light transfer. the usual pass/fail point is around 40%

 

[fbaurley]

Any stock diesel made since about 98 should pass an opacity test, Unless something is wrong. They are pretty much a joke, these newer engines, shouldnt even register on an opacity meter. Most of them are just a snap throttle test( a blip of the go pedal) at a lot of places. Now if they measure for hydrocarbon , or CO with another analyzer, you may have an issue.

 

[Van Blom]

Thanks guys,I think I'll try it without the cat

 

[vegasredneck]

We have to smog in Vegas as of last year. The test is a joke but no kitty no pass. They run the truck up to 40 mph and has a fail rate of 30%. There is no load on the dyno so my results were 2% with an early 99 PSD last week but failed because it does not have the cat under it. So I ordered a 4" race muffler from summit for $38 had a muffler shop add it and it passed. All the guy saw was another pipe under it beside the muffler.

He did tell me that the rest of the country will be testing in bigger city soon. so my advise to you is to keep the kitty if you remove it just incase you have to test in the future or you can punch the guts out.

 

[Mark Craig]

Van Blom,



We sell a lot of our MBRP performance replacement mufflers and a large number of those folks also get teh cat test pipe for off road use and racing etc. There have been a few that said it was too loud, but the majority of them loved it, sound volume wise and tone wise etc. Of course everybody is different as to what loud and whats not etc. I suggest you try the muffler I mentioned 1st, then add the cat pipe if the muffler is too quiet for your individual taste etc. The muffler is built from 409 stainless, has the welded hangers on it to reuse the factory rubber mounts and is a breeze to install, the cat pipe is available in 409 SS or aluminized and just slips in place of the cat. We have done the muffler 1st then listen to the sound with a lot of customers and it has worked very well, give it a try or call us and we will try to help you with any questions etc.



Mark @ DPPI

 

[srichard]

Mark: do you guys have the muffler back in stock? I called a few weeks ago and you were out.