Mack Doctor Jr. Posted December 18, 2011 Share Posted December 18, 2011 I really like the Dynaflex Exhaust that is on the market right now. I will tell u guys what im looking for and hope I get some better ideas and feedback.Im thinking 6" duals on an MH with an E9. I would like the lengths to be able to be changed ( reason why I think Dynaflex is the best choice). I need to have short stacks to clear the asphalt plant and some tall ones to pull vans in the winter.I have never been around them and think their design would be ideal for what im wanting to do. I know they are expensive, but im kinda restoring the truck to working condition and do want a nice set of stacks.When looking at the 4 States catalog it looks like the Freightliner 6" kit may work for my application.Any feed back will be greatly appreciated before spending that much money. Thanks in advance ~Joe Quote Link to comment https://www.bigmacktrucks.com/topic/22179-dynaflex-exhaust/ Share on other sites More sharing options...
smorse54 Posted December 18, 2011 Share Posted December 18, 2011 I put a set of 7 inch Dynaflex stacks on a Freightliner Classic for a customer last year. They are high quality,the finish is great,the elbows fit. I really liked the way the stacks joined together under the mounting brackets so it looks like one piece.I would Neversieze the upper stack so it could be swapped out for your needs. I see this truck regularly and they still look like new.These would be my choice.Steve 1 Quote Link to comment https://www.bigmacktrucks.com/topic/22179-dynaflex-exhaust/#findComment-94540 Share on other sites More sharing options...
Mack Doctor Jr. Posted December 18, 2011 Author Share Posted December 18, 2011 Thanks Steve... I really wish they made a bolt on kit for Macks... Quote Link to comment https://www.bigmacktrucks.com/topic/22179-dynaflex-exhaust/#findComment-94546 Share on other sites More sharing options...
Rob Posted December 18, 2011 Share Posted December 18, 2011 Any chance you could use a ball and socket set like cabovers used? That would make swapping out easy with no connections to break loose.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/22179-dynaflex-exhaust/#findComment-94548 Share on other sites More sharing options...
Mack Doctor Jr. Posted December 18, 2011 Author Share Posted December 18, 2011 Never heard of that Rob. Do u have any website I can go to check it out? Quote Link to comment https://www.bigmacktrucks.com/topic/22179-dynaflex-exhaust/#findComment-94559 Share on other sites More sharing options...
Rob Posted December 18, 2011 Share Posted December 18, 2011 I know Donaldson still markets them. I don't know if it is offered in chrome or not however. They were a bell and flare shaped affair on the upper part rigid mounted, and a ball type affair that mounted rigid to the lower exhaust. They leaked very little when the cab was let down and the two pipes slid together.These aren't large enough but someone else may market larger.http://www.donaldson.com/en/exhaust/support/datalibrary/040443.pdfRob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/22179-dynaflex-exhaust/#findComment-94561 Share on other sites More sharing options...
Mack Doctor Jr. Posted December 18, 2011 Author Share Posted December 18, 2011 I was just gonna use the the frame style exhaust mount brackets. From what I understand the style u are talking about, the stacks must bolt to the cab? Quote Link to comment https://www.bigmacktrucks.com/topic/22179-dynaflex-exhaust/#findComment-94563 Share on other sites More sharing options...
Rob Posted December 18, 2011 Share Posted December 18, 2011 I was just gonna use the the frame style exhaust mount brackets. From what I understand the style u are talking about, the stacks must bolt to the cab?Yes, that is how they were designed to work but a "Torin" stainless band clamp would work well if you are going to use a rigid mount like the original setup. Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/22179-dynaflex-exhaust/#findComment-94564 Share on other sites More sharing options...
other dog Posted December 18, 2011 Share Posted December 18, 2011 I know Donaldson still markets them. I don't know if it is offered in chrome or not however. They were a bell and flare shaped affair on the upper part rigid mounted, and a ball type affair that mounted rigid to the lower exhaust. They leaked very little when the cab was let down and the two pipes slid together.These aren't large enough but someone else may market larger.http://www.donaldson...rary/040443.pdfRobI only saw those on Peterbilt cabovers. Quote Producer of poorly photo-chopped pictures since 1999. Link to comment https://www.bigmacktrucks.com/topic/22179-dynaflex-exhaust/#findComment-94565 Share on other sites More sharing options...
Rob Posted December 18, 2011 Share Posted December 18, 2011 I only saw those on Peterbilt cabovers.I'd seen those on most cabovers of the 60's and 70's. Wasn't really around much of the 80's stuff before they died out.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/22179-dynaflex-exhaust/#findComment-94566 Share on other sites More sharing options...
Mack Doctor Jr. Posted December 18, 2011 Author Share Posted December 18, 2011 Looks very cool to me. Thanks Rob. Quote Link to comment https://www.bigmacktrucks.com/topic/22179-dynaflex-exhaust/#findComment-94567 Share on other sites More sharing options...
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