cast iron kitchen sink

i had to rerun a pipe under the house for my kitchen sink, replaced the original cast iron line with 2" pvc.?
now the sink drains real slow, do i need to add a 45 degree fitting towards the top of the line to vent the line to help the sink in draining?
Did you use the same size replacement pipe? Was the old pipe vented? If it was not vented it sounds like it needs to be. Without a vent pipes do not flow freely. Were all the joints clean no burrs inside which may collect debris.
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![]() KOHLER CAST IRON UNDERMOUNT BLACK ON BLACK KITCHEN SINK 33 X 32 K 5877 4U NEW US $250.00
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