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So I've seen that the use of Borla XR-1s with an OBX downpipe were pretty common on Rs, but I couldn't find any in depth information about it. There are dual pipes coming from the resonator back. Do people merge these two pipes into a single pipe to connect to the Borla muffler, or do they get a new 3" single pipe to replace the dual pipes?
 

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So I've seen that the use of Borla XR-1s with an OBX downpipe were pretty common on Rs, but I couldn't find any in depth information about it. There are dual pipes coming from the resonator back. Do people merge these two pipes into a single pipe to connect to the Borla muffler, or do they get a new 3" single pipe to replace the dual pipes?
On my R, I replaced the dual pipes with a single 3" pipe.
 
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