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Car Forum / Dodge / Dodge Trucks / March 2007muffler bypass - pointless!
cut out my muffler and welded in a piece of pipe, and the difference is next to nothing. it really doesnt sound any louder than before i removed the muffler. the only time i can tell any difference at all is during heavy acceleration. .....anybody ever gut the cat instead of removing it completely?  SignatureNathan in Montana http://ConcealedCarryForum.com http://1911Talk.com http://GlockCarry.com er, sorry! 2005 cummins dually 4x4. > cut out my muffler and welded in a piece of pipe, and the difference is > next to nothing. it really doesnt sound any louder than before i removed > the muffler. the only time i can tell any difference at all is during > heavy acceleration. > > .....anybody ever gut the cat instead of removing it completely? A young gentleman at out local tech school had done that to his(maybe his dads) '05 and it is noticably louder. Didn't really ask him what else was done to it but I'm sure it's been played with. Smokes worse than an old Vega on accel. Denny > er, sorry! 2005 cummins dually 4x4. > [quoted text clipped - 4 lines] >> >> .....anybody ever gut the cat instead of removing it completely? "Smokes worse than an old Vega" Yeah but what's a little smoke? It's LOUD, man...more powerful, more manly! > A young gentleman at out local tech school had done that to his(maybe his > dads) '05 and it is noticably louder. Didn't really ask him what else was [quoted text clipped - 19 lines] > > - Show quoted text - Hey, before you gut it, check out the prices at your local recycler/ smelting operation....for years I'd just punch the grid out on a melted (or non-smog) vehicle, and these days the prices are amazing! The lowest price paid at the local yard (small, universal pre-obdII) was $35, I got $70 for the one I was turning in. Might be smarter to splice in a section of pipe. Jon IT IS ILLEGAL TO REMOVE OR ALTER THE CAT CONVERTER It may not even run correctly > IT IS ILLEGAL TO REMOVE OR ALTER THE CAT CONVERTER > It may not even run correctly Thank you for the caps. The key word is MUFFLER !!! Regardless, it's still illegal. >> IT IS ILLEGAL TO REMOVE OR ALTER THE CAT CONVERTER >> It may not even run correctly > > Thank you for the caps. The key word is MUFFLER !!! > Regardless, it's still illegal. So are a lot of things. Your point? >>> IT IS ILLEGAL TO REMOVE OR ALTER THE CAT CONVERTER >>> It may not even run correctly >> >> Thank you for the caps. The key word is MUFFLER !!! The OP removed the muffler, then asks about gutting the cat. Lynn points out it's illegal to remove or alter the catalytic converter and you point out the key word is muffler. Both cat and muffler are key words. >> Regardless, it's still illegal. > [quoted text clipped - 4 lines] >>> >>> Thank you for the caps. The key word is MUFFLER !!! >So are a lot of things. Your point? His point is it is illegal and the power gain will be a state on mind more than reality, especailly at lower RPM's. People such as you cannot begin to understand the roll that backpressure plays in over all engine performance. A lower RPM's a little backpressure improves efficency and less hurts it but hey you are a know it all so what the heck. ----------------- TheSnoMan.com >>So are a lot of things. Your point? > [quoted text clipped - 6 lines] > ----------------- > TheSnoMan.com hey clueless, my understanding was that Nathan wanted it for the increased noise. look at the title, muffler bypass pointless. he states that his truck still sounded the same. granted there are laws against removing the cats. > cannot begin to understand the roll that backpressure plays in over > all engine performance. A lower RPM's a little backpressure improves > efficency and less hurts it but hey you are a know it all so what the > heck. Backpressure.... now THAT'S funny. Hey genius, how much additional "backpressure" do you think a 4" high-flow cat (which you still refuse to admit is a cat) generates behind a 9cm² exhaust housing of the turbocharger? >>So are a lot of things. Your point? > [quoted text clipped - 4 lines] > efficency and less hurts it but hey you are a know it all so what the > heck. Hell, not aborting you at birth was illegal. WTF do you know about back pressure on a diesel? Time to adjust that sig. > ----------------- > TheSnoFraud.com >>>So are a lot of things. Your point? >> [quoted text clipped - 6 lines] > > Hell, not aborting you at birth was illegal. Now 'that' was good...... <GBMFG> Denny Nathan, Your first asumption is that the DC engineers are clueless and you can really make a difference over their design without knowing anything about it. Amazing! Steve > cut out my muffler and welded in a piece of pipe, and the difference is > next to nothing. it really doesnt sound any louder than before i removed > the muffler. the only time i can tell any difference at all is during > heavy acceleration. > > .....anybody ever gut the cat instead of removing it completely? > Your first asumption is that the DC engineers are clueless and you can > really make a difference over their design without knowing anything about > it. i never said _anything_ about either. youre a stool. SignatureNathan in Montana http://ConcealedCarryForum.com http://1911Talk.com http://GlockCarry.com I gutted mine. I don't see a difference but then I don't have a pyro gauge so I don't know how much it lowered my temps. That's the reason I did it. I wanted a free flowing exhaust. John > cut out my muffler and welded in a piece of pipe, and the difference > is next to nothing. it really doesnt sound any louder than before i > removed the muffler. the only time i can tell any difference at all > is during heavy acceleration. > > .....anybody ever gut the cat instead of removing it completely? >I gutted mine. I don't see a difference but then I don't have a pyro gauge >so I don't know how much it lowered my temps. That's the reason I did it. I >wanted a free flowing exhaust. thanks for the useful information, this is what i was looking for. how does yours sound? is there any whistling noise that ive heard of? what year is your truck? thanks, SignatureNathan in Montana http://ConcealedCarryForum.com http://1911Talk.com http://GlockCarry.com No change in sound. Mine is a 96. John >>I gutted mine. I don't see a difference but then I don't have a pyro >>gauge so I don't know how much it lowered my temps. That's the reason [quoted text clipped - 4 lines] > what year is your truck? > thanks, >I gutted mine. I don't see a difference but then I don't have a pyro gauge >so I don't know how much it lowered my temps. That's the reason I did it. I >wanted a free flowing exhaust. Hmmmm breaking a windshield and having the insuranc company pay for it is a no, no. But destroying a cat is okay? Gotta love consistancy . > John >> cut out my muffler and welded in a piece of pipe, and the difference is [quoted text clipped - 3 lines] >> >> .....anybody ever gut the cat instead of removing it completely? It's a NJ truck. Cats aren't required in my state. Degutting a cat is not defrauding any one either. >>I gutted mine. I don't see a difference but then I don't have a pyro >>gauge so I don't know how much it lowered my temps. That's the reason [quoted text clipped - 10 lines] >>> >>> .....anybody ever gut the cat instead of removing it completely? > It's a NJ truck. Cats aren't required in my state. > Degutting a cat is not defrauding any one either. Aren't cats under Federal jurisdiction? No idea. Maybe it depends on the year of manufacture. I know that here we have safety inspections and we're allowed to switch to larger exhausts minus the cats >> It's a NJ truck. Cats aren't required in my state. >> Degutting a cat is not defrauding any one either. > > Aren't cats under Federal jurisdiction? > No idea. Maybe it depends on the year of manufacture. > I know that here we have safety inspections and we're allowed to switch [quoted text clipped - 4 lines] >> >>Aren't cats under Federal jurisdiction? Yes, it's a federal requirement. State doesn't have a requirement, because the feds already do. Removal or modification of the cat carries a $10K fine. Signature.boB 2006 FXDI hot rod 2001 Dodge Dakota QC 5.9/4x4/3.92 1966 Mustang Coupe - Daily Driver 1965 FFR Cobra - 427W EFI, Damn Fast. >> No idea. Maybe it depends on the year of manufacture. >> I know that here we have safety inspections and we're allowed to switch >> to larger exhausts minus the cats >> >>>>It's a NJ truck. Cats aren't required in my state. >>>>Degutting a cat is not defrauding any one either. Incorrect statement Sir. Cats are required by Federal law on ALL vehicles produced after the mid '70s or these about (IIRC). Just because a certain state, AZ (in places here) for example, do not conduct emissions testing, does not allow one to "legally" remove or otherwise alter your cats. Emissions regulations vary considerably from jurisdiction to jurisdiction, as do what engines are regulated. In North America any spark ignition engine of over 19 kW (25 hp) power output built later than January 1, 2004 probably has a three-way catalytic converter installed. Diesel engine regulations are similarly varied, with some jurisdictions focusing on NOx (Nitric Oxide and Nitrogen Dioxide) emissions and others focusing on particulate (soot) emissions. Diesel Engines For compression ignition (i.e., Diesel) engines, the most commonly used catalytic converter is the diesel oxidation catalyst. The catalyst uses excess O2 (oxygen) in the exhaust gas stream to oxidize CO (Carbon Monoxide) to CO2 (Carbon Dioxide) and HC (hydrocarbons) to H2O (water) and CO2. These converters often reach 90% effectiveness, virtually eliminating diesel odor and helping to reduce visible particulates (soot), however they are incapable of reducing NOx as chemical reactions always occur in the simplest possible way, and the existing O2 in the exhaust gas stream would react first. To reduce NOx on a compression ignition engine it is necessary to change the exhaust gas - two main technologies are used for this - selective catalytic reduction (SCR) and NOx (NOx) traps (or NOx Adsorbers). Another issue for diesel engines is particulate (soot). This can be controlled by a soot trap or diesel particulate filter (DPF), as catalytic converters are unable to affect elemental carbon (however they will remove up to 90% of the soluble organic fraction). A clogging soot filter creates a lot of back pressure decreasing engine performance. However, once clogged, the filter goes through a regeneration cycle where diesel fuel is injected directly into the exhaust stream and the soot is burned off. After the soot has been burned off the regeneration cycle stops and injection of diesel fuel stops. This regeneration cycle will not affect performance of the engine. All major diesel engine manufacturers in the USA (Ford, Caterpillar, Cummins, Volvo, MMC) starting January 1, 2007 are required to have a catalytic converter and a soot filter inline, as per a new DoT legislation.[citation needed]
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