r686st Posted March 12, 2014 Share Posted March 12, 2014 Hi, everyone I'm having a problem... I have posted pics of my build under 1991 RD690S and during that time I changed the exhaust to a straight 5" turnout style that's 48" tall. I have the factory elbow with a 4-5 inch expander with two exhaust straps/clamps connecting everything. The idea was to keep from bending or breaking the exhaust with a limb since I do work for people with low hanging limbs over their driveway. My question is can you recommend a height/length of stack to get the noise away from the cab without getting too tall? Do I need the 5" ID or OD I can't remember what style I bought? Could you post pictures of your setups maybe with a tape measure by the top as well as an overall view of the truck so I can see different setups? FYI: I plan to stay with 5" diameter turnout style and it looks like they come in 6-10 foot sizes in the one piece design. Quote Link to comment Share on other sites More sharing options...
rsb502 Posted March 12, 2014 Share Posted March 12, 2014 Get it at least 12" above the cab, if you want to quiet it down and keep the straight pipe look get a stack muffler that fits inside your pipe. As far as how high, nobody else knows where you run better than you just look at your territory and see what will work. I have mine sitting at 12'6" and they hit a limb every now an then but I don't go down into bad areas with it either. My 84 had a single 5" that was around 11'6" and it rarely hit anything but again I'm picky about where I take my trucks. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment Share on other sites More sharing options...
2stacksuperdog Posted March 12, 2014 Share Posted March 12, 2014 if i remember right this is either a 5ft or 6ft pipe. Cant remember which. i could go get a measurement tomorrow 1 Quote Matt Link to comment Share on other sites More sharing options...
Lmackattack Posted March 12, 2014 Share Posted March 12, 2014 I'm at 12'4" and hit branches on back roads. The RD I drive at work is about 10' and don't have a problem.....more importantly....what's the lowest bridge in your aera? Here in Chicago it's easy to find a 11'4" bridge.... Quote Link to comment Share on other sites More sharing options...
MACKS Posted March 12, 2014 Share Posted March 12, 2014 This is for a dump truck correct, would you consider going with a dump truck stack,you can cut it down to where its just above the cab shield,thats what I did,actually I made my own stack from left overs,also I scored a new Donaldson chrome internal muffler on e-bay for cheap,this setup works well for me,no noise and don't have to worry about hitting any thing with it..This is on a cl but same difference. 1 Quote Link to comment Share on other sites More sharing options...
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