cxn613 Posted November 11, 2008 Share Posted November 11, 2008 Is it ok to straight pipe a 2004 cxn 613 with a 427? What i mean by "is it ok" is will it hurt the motor or anything like that. thank you Quote Link to comment https://www.bigmacktrucks.com/topic/4717-straight-piping/ Share on other sites More sharing options...
fjh Posted November 11, 2008 Share Posted November 11, 2008 Is it ok to straight pipe a 2004 cxn 613 with a 427? What i mean by "is it ok" is will it hurt the motor or anything like that. thank youNo problem!We have done several with no ill effects! Quote Link to comment https://www.bigmacktrucks.com/topic/4717-straight-piping/#findComment-23799 Share on other sites More sharing options...
JPChrome Posted November 12, 2008 Share Posted November 12, 2008 (edited) Itll help out your fuel millage too.... loud pipes save livesIt you need pipes check us out at jpchrome.com Edited November 12, 2008 by JPChrome Quote Link to comment https://www.bigmacktrucks.com/topic/4717-straight-piping/#findComment-23833 Share on other sites More sharing options...
Mackpro Posted November 12, 2008 Share Posted November 12, 2008 Is it ok to straight pipe a 2004 cxn 613 with a 427? What i mean by "is it ok" is will it hurt the motor or anything like that. thank youIf your CXN has the muffler under the cab and you remove it , you will see a power and MPG increase. Those bottom muffler are very restrictive. We do alot of those here as well. Quote Link to comment https://www.bigmacktrucks.com/topic/4717-straight-piping/#findComment-23866 Share on other sites More sharing options...
Gambi80 Posted November 13, 2008 Share Posted November 13, 2008 Hmm...I've got the twice pipe set up w/mufflers...any mpg increase with straights over mufflers with 2? Quote Ever wonder how a blind person knows when to stop wiping? Link to comment https://www.bigmacktrucks.com/topic/4717-straight-piping/#findComment-23925 Share on other sites More sharing options...
Mackpro Posted November 13, 2008 Share Posted November 13, 2008 Hmm...I've got the twice pipe set up w/mufflers...any mpg increase with straights over mufflers with 2?We did one a daycab CX not long ago that had factory dual with 2 mufflers and it didnt help much. The owner said it sound good, but after all day of hearing it roar right behind the cab he wishes he would have left it as is. I did drive it and it was loud. Loud enough its hard to talk on a cell phone. The sleeper trucks seem alot more quite due to the exhaust being farther away. Quote Link to comment https://www.bigmacktrucks.com/topic/4717-straight-piping/#findComment-23965 Share on other sites More sharing options...
theakerstwo Posted November 13, 2008 Share Posted November 13, 2008 I am one who like no noise at all and i like to use the jake where ever with out having the fear of a ticket or botheren any one. I think it is very childess in a grown man to wake up every one in town with jakes when all it is being dont for is to say ha guys look at me. I have listen to engines run all my live and am hard hearing over the rackety and dont need any more of it.What i do like is hear a engine run under load with a short muffler and long tail pipe but can live with out that for the sake of my ears. So much for that and that is free my 2 cents worth. glenn Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/4717-straight-piping/#findComment-23969 Share on other sites More sharing options...
fjh Posted November 13, 2008 Share Posted November 13, 2008 I am one who like no noise at all and i like to use the jake where ever with out having the fear of a ticket or botheren any one. I think it is very childess in a grown man to wake up every one in town with jakes when all it is being dont for is to say ha guys look at me. I have listen to engines run all my live and am hard hearing over the rackety and dont need any more of it.What i do like is hear a engine run under load with a short muffler and long tail pipe but can live with out that for the sake of my ears. So much for that and that is free my 2 cents worth. glennGlenn I'm with ya pal!One exception thou!I like the sound of a V8 pulling, straight pipe or not!Kind of a locamotive sound to it! Real powerful throb! Quote Link to comment https://www.bigmacktrucks.com/topic/4717-straight-piping/#findComment-24005 Share on other sites More sharing options...
theakerstwo Posted November 13, 2008 Share Posted November 13, 2008 Glenn I'm with ya pal!One exception thou!I like the sound of a V8 pulling, straight pipe or not!Kind of a locamotive sound to it! Real powerful throb! Ya we are talking about the E9 I had one sitting in the shop and we was mashing on it trying to find a miss and it shook a clock off a cement block wall hanging on a nail. They shake the ground they stand on.glenn Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/4717-straight-piping/#findComment-24017 Share on other sites More sharing options...
Gambi80 Posted November 14, 2008 Share Posted November 14, 2008 (edited) We did one a daycab CX not long ago that had factory dual with 2 mufflers and it didnt help much. The owner said it sound good, but after all day of hearing it roar right behind the cab he wishes he would have left it as is. I did drive it and it was loud. Loud enough its hard to talk on a cell phone. The sleeper trucks seem alot more quite due to the exhaust being farther away.I think I'm just looking for any excuse to do so. Sad thing though, the straight pipes and related hardware will cost about 4 times what it cost me to put new mufflers and turn-outs on a year ago. However, I do think the Mack with straights has the best sound compared to the rest. Unfortunately, I've got the combination jake brake and exhaust brake...so there's relatively little noise...almost sounds like a wet fart. I suppose I could clamp off the air line to the butterfly under the cab...which would make it more useless than it already is. Edited November 14, 2008 by Gambi80 Quote Ever wonder how a blind person knows when to stop wiping? Link to comment https://www.bigmacktrucks.com/topic/4717-straight-piping/#findComment-24072 Share on other sites More sharing options...
rw613 Posted November 14, 2008 Share Posted November 14, 2008 I think I'm just looking for any excuse to do so. Sad thing though, the straight pipes and related hardware will cost about 4 times what it cost me to put new mufflers and turn-outs on a year ago. However, I do think the Mack with straights has the best sound compared to the rest. Unfortunately, I've got the combination jake brake and exhaust brake...so there's relatively little noise...almost sounds like a wet fart. I suppose I could clamp off the air line to the butterfly under the cab...which would make it more useless than it already is.IF YOUR MUFFLER IS UNDER THE TRUCK JUST LEAVE THE PIPE THE WAY IT IS AND PUT A ELBOW ON IT AND HOOK THE PIPES TO GETHERE THIS WAY YOU WONT HAVE TO BUY THE PIPE OR MOVE YOUR FUEL LINES OR AIR LINES AND IF YOU WANT TO YOU CAN PUT A SMALL MUFFLER RIGHT ONTHE BACK PIPE BRACKET Quote Link to comment https://www.bigmacktrucks.com/topic/4717-straight-piping/#findComment-24083 Share on other sites More sharing options...
Mike Posted November 15, 2008 Share Posted November 15, 2008 If I may throw my 2 cents worth in then, I go along with Glenn because if you are talking about a stock engine then its best to stay with some restriction. All stock and some modified engines run best as test results have shown us for many years with some kind of muffler. Its called reversion. Its has to do with sound waves coming from the header pipe or pipes. Tests have shown some mufflers work better than others. We all LOVE the naturally aspirated engines or we would be begging for the electric motors to power our vehicles. But...... If you want to be deaf early in life then go ahead and blow them eardrums out. One thing that I dislike is to talk to a person when all they can say to me is HUH, every time I speak to them. Most of the time I walk off, and think to myself that person is dumber than dog crap. And they won't listen to me or anyone else even if they were not deaf.Happy Sound Waves To You!mike Quote Link to comment https://www.bigmacktrucks.com/topic/4717-straight-piping/#findComment-24123 Share on other sites More sharing options...
other dog Posted November 15, 2008 Share Posted November 15, 2008 Glenn I'm with ya pal!One exception thou!I like the sound of a V8 pulling, straight pipe or not!Kind of a locamotive sound to it! Real powerful throb!I'll agree with that Quote Producer of poorly photo-chopped pictures since 1999. Link to comment https://www.bigmacktrucks.com/topic/4717-straight-piping/#findComment-24135 Share on other sites More sharing options...
other dog Posted November 15, 2008 Share Posted November 15, 2008 If I may throw my 2 cents worth in then, I go along with Glenn because if you are talking about a stock engine then its best to stay with some restriction. All stock and some modified engines run best as test results have shown us for many years with some kind of muffler. Its called reversion. Its has to do with sound waves coming from the header pipe or pipes. Tests have shown some mufflers work better than others. We all LOVE the naturally aspirated engines or we would be begging for the electric motors to power our vehicles. But...... If you want to be deaf early in life then go ahead and blow them eardrums out. One thing that I dislike is to talk to a person when all they can say to me is HUH, every time I speak to them. Most of the time I walk off, and think to myself that person is dumber than dog crap. And they won't listen to me or anyone else even if they were not deaf.Happy Sound Waves To You!mikeThe ony reason I don't have a muffler on the mixer is because I couldn't find one anywhere around-"we can order one for 'ya, be in in a couple of weeks". So I just went with a 5" chrome stack. It's very loud, but I don't drive it too far too often.When I was younger I put a straight pipe on the f-model 300 I drove and it wasn't loud at all. Most people around here just ran straight pipes on Macks when the muffler gave out. I put one on the f-model with the 350 cummins in it too and that was a different story-very loud! But the worst (loudest) had to be the Transtar with a VT903 Cummins and straight pipe-I couldn't run one load of chips to Covington in it. I drove it once when my truck was in the shop for something. Same truck-'74 Transtars w/VT903s, except my regular unit had a muffler. I thought it sounded awesome at first, but that got old quick, and by the time I got back I had a pounding headache. I told 'em i'd wait on my truck, I cain't drive this muh#*%@ here! Quote Producer of poorly photo-chopped pictures since 1999. Link to comment https://www.bigmacktrucks.com/topic/4717-straight-piping/#findComment-24146 Share on other sites More sharing options...
other dog Posted November 15, 2008 Share Posted November 15, 2008 I am one who like no noise at all and i like to use the jake where ever with out having the fear of a ticket or botheren any one. I think it is very childess in a grown man to wake up every one in town with jakes when all it is being dont for is to say ha guys look at me. I have listen to engines run all my live and am hard hearing over the rackety and dont need any more of it.What i do like is hear a engine run under load with a short muffler and long tail pipe but can live with out that for the sake of my ears. So much for that and that is free my 2 cents worth. glennThe jake brake is one of the geatest things they ever put on a truck engine in my opinion, I run the mountains of Va, W.V, and western Pa. all the time. Did for years without a jake. I don't have anything against straight pipes, but I think that's probably why so many towns won't even let you use the jake, because of straight pipes. I've never put a straight pipe on a truck that had a jake brake. Quote Producer of poorly photo-chopped pictures since 1999. Link to comment https://www.bigmacktrucks.com/topic/4717-straight-piping/#findComment-24147 Share on other sites More sharing options...
ThaddeusW Posted November 15, 2008 Share Posted November 15, 2008 I don't understand the whole strait pipe crowd so much but I admit I like the sound. I would put a short muffler under the cab and rig a bypass pipe around it with a butterfly valve to turn the strait pipes on and off. Just plumb an air switch or use a solenoid valve to open and close the butterfly valve. Then you can make some noise if you want or keep it quiet. I have two ideas one is a muffler with a built in bypass valve and the other is a method of strait piping newer EPA 2007 and 2010 engines without bypassing the emissions systems. Quote -Thad What America needs is less bull and more Bulldog! Link to comment https://www.bigmacktrucks.com/topic/4717-straight-piping/#findComment-24178 Share on other sites More sharing options...
HK Trucking Posted November 16, 2008 Share Posted November 16, 2008 Straight pipe sound from the archives: Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment https://www.bigmacktrucks.com/topic/4717-straight-piping/#findComment-24258 Share on other sites More sharing options...
Cobb Posted November 16, 2008 Share Posted November 16, 2008 1965 B-53 Mack cement mixer with a 673 Thermodyne and straight pipe ... Quote Link to comment https://www.bigmacktrucks.com/topic/4717-straight-piping/#findComment-24273 Share on other sites More sharing options...
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