Engine/Transmission (1994 - 1998) straight pipe

[cmills]

it doesn't hurt to straight pipe the 12 valvers does it, even though it has a catalytic converter instead of a resonator, I figure since you can a 24 valver you could a 12 also with no problems.



thanks

 

[CogginsP]

I straight-piped my rig... less back pressure the better

 

[hummincummins2]

i would deff. straight pipe it like CogginsP said the less back pressure the better, and also you will get more air flow and your EGT's will decrease by 50*.

 

[Signal73]

and while your at it smash out the honeycomb material of the cat, its most likely getting clogged up by now.

 

[cmills]

ok

thanks, I was pretty sure it would be okay if the cat was removed but wasn't sure.



thanks again

 

[Ahopper]

it droped my temps and it sounds great i had to gut the cat though b/c in phoenix(maricopa county) they require one. they just take a mirror and look to see if something that looks like one is under ther. no biggie though i just cut it down the middle took the honeycomb out and welded it back up

 

[THess]

I had my truck for years before I straight piped it. The pipes were rusty so I asked my muffler guy just to weld an elbow down to the ground before the converter and the muffler. Big mistake. Now it sounds great but that drone gets pretty old on the interstate. My advice is to keep the stock exhaust exit unless you really like the noise.

 

[bmoeller]

My advice is to keep the stock exhaust exit unless you really like the noise.

Stacks are nice.

 

[hummincummins2]

stacks are nice, and loud!

 

[JPittinger]

I'll take your cat if you're just going to git rid of it...

 

[CTD12V]

As long as you don't live in an area that requires diesel emmisions testing, you can probably get away with removing the cat. It is supposedly a federal offense to have it removed, with fines up to $25,000 per day of violation if some stinkin' EPA Nazi wants to stick it to you. I have heard stories of the EPA going through parking lots and putting a mirror under the truck, but those may be urban legends. At any rate, the cat was gone from my truck when I bought it a few years ago, and here in Colorado Springs, which is part of some lovely "clean air program" crap, the local emmissions testing guy made me put a cat back on my truck #@$%! #@$%! #@$%!



Enjoy your straight pipes.



CTD12V

 

[hummincummins2]

that sucks, does anyone know if they have an emissions test in MA

 

[SSage]

When did the cat start being put on the 12 valves? My 95 had a resonator and a muffler, no cat.

 

[Signal73]

My 95 had a cat, no resonator.

 

[Kennywould]

I believe the cats were put on in 05"

 

[Kennywould]

I took the stock exhaust off and put MBRP cool duals on from cat back i figured they would start emissions testing here in PA as soon as I took it off. Would be my luck!

 

[WDixon27]

i think that's on a manufacture/dealership level, by time it gets into the end users hands the epa doesn't really care, the one that screws with you is the inspection station and the extent that goes to depends on how hard they hug the trees in your area

It is supposedly a federal offense to have it removed, with fines up to $25,000 per day of violation

 

[Ahopper]

my 97 had a cat on it and a muffler right after it.

 

[SSage]

Are you guys looking at the resonator and mistaking it for a cat? I don't know about the cali trucks but, I think the cats were put on the 2005's or the 2004. 5's were there cat equipped trucks before that?



My trucks have not had a cat, the newest one is a 2003 and it only had one large muffler. My 95 had a resonator just after the down pipe and the it had a muffler just before the rear axle.

 

[arthr31]

In MA, only the 10000 lb trucks get tested. At most, on smaller setups like ours they do a two-stage soot test. Depending on the year and build location, the pre'98s had cats, some did, some didn't. I think on dodgeram.org there's a break down by year.
I have no cat, straight mbrp. I fear that i will not pass the soot test this year. . way too much fuel...