Mikesbucketlistmack Posted October 16, 2013 Share Posted October 16, 2013 I'd like to replace the stock muffler and exhaust on my 1981 R 600 single axle dump (former state truck) with a 7 inch monster stack. First of all, will this make the truck too loud, and where's a good place to purchase this online ? Raney's Truck Parts has some but they are only reduced to a 5 inch inlet on the bottom and the pipe on my truck is only 4 inch. They don't have any 5 to 4 inch reducers, neither. Any suggestions, guys ? Quote Link to comment Share on other sites More sharing options...
j hancock Posted October 16, 2013 Share Posted October 16, 2013 I like R model truck exhaust stock but Winfall wimmin stacked!Hope that doesn't make me a bad person.... 1 1 Quote JimIt doesn't cost anything to pay attention. Link to comment Share on other sites More sharing options...
vision386 Posted October 16, 2013 Share Posted October 16, 2013 Ever spent any time in an R-Model without a muffler?........................Mark 2 Quote Mack Truck literate. Computer illiterate. Link to comment Share on other sites More sharing options...
2stacksuperdog Posted October 16, 2013 Share Posted October 16, 2013 Keep it to a 5" or 4". anything bigger looks goofy 1 1 Quote Matt Link to comment Share on other sites More sharing options...
1MACK1 Posted October 16, 2013 Share Posted October 16, 2013 Have twin stacks on r model with one muffler lovely to drive all day / value liner has single stack no muffler sounds great for short drives but not working all day Quote Link to comment Share on other sites More sharing options...
blackdog2 Posted October 16, 2013 Share Posted October 16, 2013 Keep it above cab 5 in 1 Quote Ed Link to comment Share on other sites More sharing options...
220cummins Posted October 16, 2013 Share Posted October 16, 2013 to each his own 1 Quote Link to comment Share on other sites More sharing options...
Mike Posted October 16, 2013 Share Posted October 16, 2013 It is to each his own, but for me if it is going to be a full blown custom then any stack is good. But if it is mostly stock then put stock on the truck.mike 1 Quote Link to comment Share on other sites More sharing options...
Jamied625 Posted October 16, 2013 Share Posted October 16, 2013 I would step it down to the 4" under the cab maybe so it runs to where the stack connects at 5" and you dont see all adapters, and I have a 5" straight no mufflers on my R model and it is loud but not unbearable(i like a louder truck) personal preference i guessJamie Quote Link to comment Share on other sites More sharing options...
Popular Post MACKS Posted October 17, 2013 Popular Post Share Posted October 17, 2013 I had 5" straight with a dump truck stack on my 83,no issue with noise as long as the windows were closed.. 4 Quote Link to comment Share on other sites More sharing options...
Mikesbucketlistmack Posted October 17, 2013 Author Share Posted October 17, 2013 Thanks, guys for the good advice as usual. Where did you get that chrome top on your air cleaner, Macks ? Quote Link to comment Share on other sites More sharing options...
RowdyRebel Posted October 17, 2013 Share Posted October 17, 2013 There's a baby blue Freightshaker Classic running around here with a pair of stacks as big around as a 5 gallon bucket...looks goofy as hell considering it's a coal hauler and NOTHING else on the truck is custom. I bet they catch quite a bit of rain if they don't get 'em covered... Quote When approaching a 4-way stop, the vehicle with the biggest tires has the right of way! Link to comment Share on other sites More sharing options...
Mikesbucketlistmack Posted October 17, 2013 Author Share Posted October 17, 2013 Hey Jaime, with the 5 to 4 inch adapter, is that "inside or outside diameter" on the adapter ? Do you remember where you got yours?/Thanks, Mike Quote Link to comment Share on other sites More sharing options...
2stacksuperdog Posted October 17, 2013 Share Posted October 17, 2013 I got an adapter on my r going from 4 to 5 1 Quote Matt Link to comment Share on other sites More sharing options...
Freightrain Posted October 17, 2013 Share Posted October 17, 2013 That big 7" will drone like a mad man and you'll be wearing ear plugs to survive the day.Even my lil 673 was unbearable with a 5" pipe. The 4" has a nice bark without the drone of the big pipe.grand rock sells reducers:http://www.grpipes.com/catalogpages/Reducers.pdf Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment Share on other sites More sharing options...
Lmackattack Posted October 17, 2013 Share Posted October 17, 2013 I have dual 5" straight stacks and it's not loud in the cab. A single 5" will be slightly louder but if the exit is above the cab you will be fine....I would not go bigger than 5-6" anything larger looks like a cartoon in my opinion. Not to mention the drone and vibration it may have... Also I like a truck that can "throw" the smoke ....the big pipes just look lazy with smoke trickling out... Quote Link to comment Share on other sites More sharing options...
mack mhe9 Posted October 17, 2013 Share Posted October 17, 2013 This runs around my area. Sweet ride. 1 Quote Link to comment Share on other sites More sharing options...
fullfuel01 Posted October 17, 2013 Share Posted October 17, 2013 Who would keep a 4'' after seing this?? Let the dog bark! Quote Link to comment Share on other sites More sharing options...
Popular Post 2stacksuperdog Posted October 17, 2013 Popular Post Share Posted October 17, 2013 Sorry but that just looks stupid.....dont mean to offend anyone but its the truth 3 Quote Matt Link to comment Share on other sites More sharing options...
mack mhe9 Posted October 17, 2013 Share Posted October 17, 2013 He run the R hard. I see him pulling a triaxle dump all the time. Big clouds of smoke on the shifts. Some day if I ever see him parked I'll ask what's up. Quote Link to comment Share on other sites More sharing options...
Popular Post Back In Black Pulling Posted October 17, 2013 Popular Post Share Posted October 17, 2013 on the lighter sidehttp://www.youtube.com/watch?v=UV6H9uBprFk&list=FL16vhL0L9BZjSKt9mmFYLtw&index=8 2 1 Quote Link to comment Share on other sites More sharing options...
Mikesbucketlistmack Posted October 18, 2013 Author Share Posted October 18, 2013 Yeah, you guys are right. 7 inch would definitely look kind of goofy and be too loud. Sticking to a 5 inch would probably be best. Thanks for the tips ! Quote Link to comment Share on other sites More sharing options...
wastenafarmtrucking Posted October 18, 2013 Share Posted October 18, 2013 I never run a mack with a muffler, my RD ran 4" to the back of the cab and then 5" up the cab and out past the cab protector, ran with the window down on cooler days, not to loud at all.My Vision had straight 5" all the way back with dual stacks.... cost me $200 my first trip through Ohio. Ungodly loud!Haven't pulled the muffler off my 3406B cat yet... bet it will be a window breaker with a straight 5"!I got my 4-5" adapter from my local mack dealer, non chrome. Quote Link to comment Share on other sites More sharing options...
Green Dash Posted October 18, 2013 Share Posted October 18, 2013 on the lighter sidehttp://www.youtube.com/watch?v=UV6H9uBprFk&list=FL16vhL0L9BZjSKt9mmFYLtw&index=8Excellent. Quote Jim Link to comment Share on other sites More sharing options...
gvam Posted October 18, 2013 Share Posted October 18, 2013 Back in Black nice video. I was cracking up watching itstack my stack stack Quote Link to comment Share on other sites More sharing options...
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