Risk of cracking downpipe? - MR2 Owners Club Message Board
 
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post #1 of 6 (permalink) Old March 20th, 2017, 14:22 Thread Starter
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Risk of cracking downpipe?

So I have a Berk exhaust on the way but my current exhaust (I believe it's Motorist) is setup (3in muffler -> 3-2.5in bpipe -> 3in downpipe). My old downpipe cracked and so I replaced it with my current 3in downpipe. If I bolt the bpipe to the downpipe could that crack it? Or should I just run open downpipe until my Berk exhaust comes in?
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post #2 of 6 (permalink) Old March 20th, 2017, 14:47
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The DP's crack because of the stress induced on the flange area which generally break the weakest point beside welds. The limit the stress it is best to have a bracket installed to help support the DP so all the weight, heat and vibration doesn't over stress the part. If you look at the KO DP it comes with this support bracket. Best to install something similar or else Berk exhaust or not it will eventually crack.

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post #3 of 6 (permalink) Old March 20th, 2017, 17:11 Thread Starter
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The ATS downpipe I have installed also has a support bracket like the KO downpipe and is installed. Do you think i'll be ok driving with the bpipe bolted up until my exhaust comes in? I don't mind re tightening the bolts after every drive but would like to avoid any cracking if possible
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post #4 of 6 (permalink) Old March 20th, 2017, 17:32
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If the DP is supported back to the block there shouldn't be any additional stress on the welds. If it does crack it then it won't be related to the Bpipe+ exhaust and would have failed anyway.

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post #5 of 6 (permalink) Old March 20th, 2017, 17:45 Thread Starter
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Cool good to know! Thanks Jim!
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post #6 of 6 (permalink) Old March 27th, 2017, 10:10
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i am on my 3rd donpipe they all had brackets they have all cracked so far my new berk one has a fles ppe on it lets hope that helps
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