diff --git a/src/ESP32SJA1000.cpp b/src/ESP32SJA1000.cpp
index 3c56fba..309e030 100644
--- a/src/ESP32SJA1000.cpp
+++ b/src/ESP32SJA1000.cpp
@@ -304,12 +304,12 @@ int ESP32SJA1000Class::filterExtended(long id, long mask)
   writeRegister(REG_ACRn(0), id >> 21);
   writeRegister(REG_ACRn(1), id >> 13);
   writeRegister(REG_ACRn(2), id >> 5);
-  writeRegister(REG_ACRn(3), id << 5);
+  writeRegister(REG_ACRn(3), id << 3);
 
   writeRegister(REG_AMRn(0), mask >> 21);
   writeRegister(REG_AMRn(1), mask >> 13);
   writeRegister(REG_AMRn(2), mask >> 5);
-  writeRegister(REG_AMRn(3), (mask << 5) | 0x1f);
+  writeRegister(REG_AMRn(3), (mask << 3) | 0x1f);
 
   modifyRegister(REG_MOD, 0x17, 0x00); // normal
 
diff --git a/src/MCP2515.cpp b/src/MCP2515.cpp
index a153a76..36c160d 100644
--- a/src/MCP2515.cpp
+++ b/src/MCP2515.cpp
@@ -91,6 +91,7 @@ int MCP2515Class::begin(long baudRate)
     uint8_t cnf[3];
   } CNF_MAPPER[] = {
     {  (long)8E6, (long)1000E3, { 0x00, 0x80, 0x00 } },
+    {  (long)8E6, (long)666666, { 0xC0, 0xB8, 0x01 } },
     {  (long)8E6,  (long)500E3, { 0x00, 0x90, 0x02 } },
     {  (long)8E6,  (long)250E3, { 0x00, 0xb1, 0x05 } },
     {  (long)8E6,  (long)200E3, { 0x00, 0xb4, 0x06 } },
@@ -104,6 +105,7 @@ int MCP2515Class::begin(long baudRate)
     {  (long)8E6,    (long)5E3, { 0x1f, 0xbf, 0x07 } },
 
     { (long)16E6, (long)1000E3, { 0x00, 0xd0, 0x82 } },
+    { (long)16E6, (long)666666, { 0xC0, 0xF8, 0x81 } },
     { (long)16E6,  (long)500E3, { 0x00, 0xf0, 0x86 } },
     { (long)16E6,  (long)250E3, { 0x41, 0xf1, 0x85 } },
     { (long)16E6,  (long)200E3, { 0x01, 0xfa, 0x87 } },