Emissions module with adjustable sizing

An engine system, comprising:

• an internal combustion engine, comprising:
• one or more engine cylinders;
• and
• an exhaust manifold for routing exhaust gas from the one or more engine cylinders;
• an exhaust line configured to receive exhaust gas from the exhaust manifold;
• and
• an emission module positioned in the exhaust line for treating exhaust gas, the emissions module comprising:
• a housing;
• a first catalyst substrate positioned within the housing and having an inlet end, the first catalyst substrate defining a plurality of flow passages extending longitudinally from the inlet end;
• and
• a first restrictor plate positioned at the inlet end of the first catalyst substrate to block exhaust flow through a first portion of the plurality of flow passages while allowing exhaust flow through a remaining portion of the plurality of flow passages, the first restrictor plate being in abutting engagement with the inlet end of the first catalyst substrate to form a seal between the first restrictor plate and the first catalyst substrate.

An emission module for treating exhaust gas, the emissions module comprising:

• a housing;
• a first catalyst substrate positioned within the housing and having an inlet end, the first catalyst substrate defining a plurality of flow passages extending longitudinally from the inlet end;
• a first restrictor plate positioned at the inlet end of the first catalyst substrate to block exhaust flow through a first portion of the plurality of flow passages while allowing exhaust flow through a remaining portion of the plurality of flow passages;
• a second catalyst substrate positioned within the housing and having a second inlet end, the second catalyst substrate defining a plurality of second flow passages extending longitudinally from the second inlet end;
• and
• a second restrictor plate positioned at the second inlet end of the second catalyst substrate to block exhaust flow through a first portion of the plurality of second flow passages while allowing exhaust flow through a remaining portion of the plurality of second flow passages,
• wherein the second restrictor plate comprises a second annular body defining a second hole therethrough, and wherein the second annular body blocks exhaust flow through the first portion of the plurality of second flow passages and the second hole allows exhaust flow through the remaining portion of the plurality of second flow passages.