Michael Basel is correct that there was a dual inlet lead(as in leader) pipe made for the later P210.
It is no longer available from Volvo, but a 2 piece reproduction is available.
And if the rest of your exhaust is stock, the P210 dual inlet lead pipe directly replaces the single lead and connects to the stock single lead front muffler and that is the way Volvo designed it. So in the stock trim, you still wind up flowing through the same sized mufflers and tailpipe. Volvo did the same thing to the 122 in that they added a dual inlet lead pipe, but retained the exact same sized muffler and tailpipe.
I was actually surprised to discover the P210 dual inlet lead pipe existed as I was sure that the P210 NEVER came with a dual inlet lead pipe, but upon checking the parts manual, there it was. My only excuse is I don't think I have every seen a 1967-1969 P210 as they might not have been commonly imported to the US.
In the past, whenever we used a dual outlet exhaust manifold on any PV usually with a B20 upgrade, we would use the dual inlet lead pipe from an 1800E/1800ES which is short like the B18 544. The 1800E/1800ES lead pipe has a 2" outlet, which is larger than than stock 122 or P210 dual inlet lead pipe.
We would then take the car to a local exhaust shop and let them cobble together a larger exhaust system which usually costs an additional $250.00 on top of the 1800E/1800ES lead pipe.
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Eric Hi Performance Automotive Service (formerly OVO or Old Volvos Only) Torrance, CA 90502 hiperformanceautoservice.com or oldvolvosonly.com
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