I want to remove the cat and just run srtaight but will there be any probs. after I do that. or will it run like a raped ape.

 

There should be no problems. It may be slighty louder, very slightly and as far as running like a sex offended primal, I'm assuming you are in reference to power/speed. Probably not but you may be able to hear the fat lady sing a little louder.

Rog

 

If you have emission testing in your area you may want to leave it in place. If the gov't gets there way...we will all be subjected to that test.....there will be a mad scramble for replacements cats when it happens.
BTW: I heard you can gut out the inside and weld in a piece of pipe straight through it, keeping the appearance of the cat still in place.
Most tests are just visual, not many tail pipe sniffers for diesels. Excess tail pipe smoke is another visual, called an Opacity test....

 

I would venture a guess that if the Government should decide to
"Smog Test" our diesels that there will be a grandfather clause for the older trucks. Just where it will start/stop is anybodies guess.

As am example, my '97 250HD is a Cali model and it was factory equipped with a cat. I have a buddy that has a Dodge about the same year and it was NOT equipped with a factory cat. Anybody know if, and/or when Dodge equipped their diesels with Cats?

QUESTION:
Were all '97's for the other 49 states equipped with a Cat? I always figgered that only Cali had it, could be wrong though.

Jim, you are right re welding a pipe through the center of the cat. I ran into a OBS Cali owner a year or so ago and he had done just that. I saved my cat just in case our "Anointed Uncle Obama's Regime" should ever require diesel testing throughout the nation, although it is a Federal crime to remove any factory emissions equipment. We'll just have to wait and see what the new rules are and just what it is that is expected out of our diesels for emissions.

I also was informed by and a Cali wrecking/used parts yard, "Pick & Pull" that it is against Federal law to sell a used Cat. Anyone else ever run into this?

Rog

 

here in nj, the junk yards offer up to $50 for your used cats. like you guys, i saved my cat when i removed it incase of the law change. but here, the junk yards have no problems selling them

 

fwiw, i just passed the nys diesel exhaust emissions with a gutted cat and the tony wildman chip set on stock. I failed the emissions overall because of cracked front spring bushings...such bs.

 

Without a cat and a stock muffler will you hear the turbo spool up any more? My truck pulls the trailer just fine, but i would like to have it sound better. thinking of doing a straight pipe cat and if that does not give me a better tone and whistle combo, then I will take the muffler out too... Eventually a 3.5 to 4 inch DP and a chip too, but for now I cant afford much...

 

With a straight pipe you'll hear the turbo plenty well. It will whistle at idle and you'll hear it wind up at pretty much any throttle.

 

That's the fat lady singing her sweet song.

 

Ha ha thats a good way to put It! matt... If you straight pipe, you will get alot of whistle. I chose not to sound like every other stroker around here and installed a muffler. I went with a flowmaster outlaw race. Dynomax also sells a race bullet thats sounds great on our trucks. Check the video in my sig. IMO it takes just enough whistle away and you can hear that big block Really good! and it actually made the truck louder Than with the straight pipe. Hope this helps

 

I have a '97 F350 that came with a cat. Idaho (Canyon County anyway) doesn't test diesel emissions at present. Federal requirements state if it came from the factory with a cat, it has to have one.

Gutting the cat will do the same thing without welding in a pipe through it. If the technicians see the welding, they might consider it an "emission system modification" and fail you anyway.

I installed a DiamondEye 3" - 3.5" downpipe and 4" exhaust system. I kept the factory cat and used the DiamondEye 4" muffler. She sounds great and the fat lady sings when required.

 

I just put my downpipe and straightpipe on and I LOVE the sound. The whistle at an idle and the spooling down of the turbo are kick a$$ sounds that I haven't heard before. The added benefit is the slight power increase too.

 

MooseMan:
I don't think that the welds would be visible as the inserted pipe is just tacked further inside the cat area than the area that fits over the exhaust pipe.

Rog

 

Rog,

Tacking the pipe inside the cat is different than what I hear and see some of the local guys doing. They cut off the inlet and outlet to "install" a 4" pipe to match the rest of their system.

A pipe inside the cat would definitely be a stealthy upgrade.