diff --git a/src/d_clisrv.c b/src/d_clisrv.c
index a893051c..918026db 100644
--- a/src/d_clisrv.c
+++ b/src/d_clisrv.c
@@ -518,9 +518,9 @@ static inline void resynch_write_player(resynch_pak *rsp, const size_t i)
 	for (j = 0; j < NUMPOWERS; ++j)
 		rsp->powers[j] = (UINT16)SHORT(players[i].powers[j]);
 	for (j = 0; j < NUMKARTSTUFF; ++j)
-		rsp->kartstuff[j] = (UINT16)SHORT(players[i].kartstuff[j]); // SRB2kart
+		rsp->kartstuff[j] = (INT32)SHORT(players[i].kartstuff[j]); // SRB2kart
 	for (j = 0; j < MAXPLAYERS; ++j)
-		rsp->collide[j] = (UINT16)SHORT(players[i].collide[j]); // SRB2kart
+		rsp->collide[j] = (UINT8)SHORT(players[i].collide[j]); // SRB2kart
 
 	// Score is resynched in the rspfirm resync packet
 	rsp->health = 0; // resynched with mo health
@@ -652,9 +652,9 @@ static void resynch_read_player(resynch_pak *rsp)
 	for (j = 0; j < NUMPOWERS; ++j)
 		players[i].powers[j] = (UINT16)SHORT(rsp->powers[j]);
 	for (j = 0; j < NUMKARTSTUFF; ++j)
-		players[i].kartstuff[j] = (UINT16)SHORT(rsp->kartstuff[j]); // SRB2kart
+		players[i].kartstuff[j] = (INT32)SHORT(rsp->kartstuff[j]); // SRB2kart
 	for (j = 0; j < MAXPLAYERS; ++j)
-		players[i].collide[j] = (UINT16)SHORT(rsp->collide[j]); // SRB2kart
+		players[i].collide[j] = (UINT8)SHORT(rsp->collide[j]); // SRB2kart
 
 	// Score is resynched in the rspfirm resync packet
 	players[i].health = rsp->health;
diff --git a/src/doomdef.h b/src/doomdef.h
index 0fdce69e..e2411439 100644
--- a/src/doomdef.h
+++ b/src/doomdef.h
@@ -143,16 +143,16 @@ extern FILE *logstream;
 #define DEVELOP // Disable this for release builds to remove excessive cheat commands and enable MD5 checking and stuff, all in one go. :3
 #ifdef DEVELOP
 #define VERSION    103 // Game version
-#define SUBVERSION 17 // more precise version number
+#define SUBVERSION 18 // more precise version number
 #define VERSIONSTRING "Development EXE"
-#define VERSIONSTRINGW "v1.3.17"
+#define VERSIONSTRINGW "v1.3.18"
 // most interface strings are ignored in development mode.
 // we use comprevision and compbranch instead.
 #else
 #define VERSION    103 // Game version
-#define SUBVERSION 17  // more precise version number
-#define VERSIONSTRING "DevEXE v1.3.17"
-#define VERSIONSTRINGW L"v1.3.17"
+#define SUBVERSION 18  // more precise version number
+#define VERSIONSTRING "DevEXE v1.3.18"
+#define VERSIONSTRINGW L"v1.3.18"
 // Hey! If you change this, add 1 to the MODVERSION below!
 // Otherwise we can't force updates!
 #endif
diff --git a/src/g_game.c b/src/g_game.c
index 33b8e2a2..0070b82e 100644
--- a/src/g_game.c
+++ b/src/g_game.c
@@ -2303,7 +2303,7 @@ void G_PlayerReborn(INT32 player)
 	p->pity = pity;
 
 	// SRB2kart
-	p->kartstuff[k_starpostwp] = starpostwp;
+	p->kartstuff[k_starpostwp] = starpostwp; // TODO: get these out of kartstuff, it causes desync
 	p->kartstuff[k_offroad] = offroad;
 
 	// Don't do anything immediately
diff --git a/src/k_kart.c b/src/k_kart.c
index 0202e070..19ad46b5 100644
--- a/src/k_kart.c
+++ b/src/k_kart.c
@@ -1460,7 +1460,7 @@ static fixed_t K_GetKartBoostPower(player_t *player, boolean speed)
 			boostpower = FixedDiv(boostpower, player->kartstuff[k_offroad] + FRACUNIT);
 
 	if (player->kartstuff[k_growshrinktimer] > 1
-		&& (player->kartstuff[k_growshrinktimer] > (itemtime - 25)
+		&& (player->kartstuff[k_growshrinktimer] > ((itemtime + TICRATE*2) - 25)
 		|| player->kartstuff[k_growshrinktimer] <= 26))
 	{												// Mega Mushroom - Mid-size
 		if (speed)
@@ -1468,7 +1468,7 @@ static fixed_t K_GetKartBoostPower(player_t *player, boolean speed)
 			boostvalue = max(boostvalue, FRACUNIT/8); // + 12.5%
 		}
 	}
-	if (player->kartstuff[k_growshrinktimer] < (itemtime - 25)
+	if (player->kartstuff[k_growshrinktimer] < ((itemtime + TICRATE*2) - 25)
 		&& player->kartstuff[k_growshrinktimer] > 26)
 	{												// Mega Mushroom
 		if (speed)
@@ -2964,7 +2964,7 @@ void K_MoveKartPlayer(player_t *player, boolean onground)
 			player->kartstuff[k_boosting] = 0;
 
 		// Megashroom - Make the player grow!
-		if (player->kartstuff[k_growshrinktimer] > (itemtime - 25))
+		if (player->kartstuff[k_growshrinktimer] > ((itemtime + TICRATE*2) - 25))
 		{
 			if (leveltime & 2)
 				player->mo->destscale = FRACUNIT*3/2;
@@ -2972,7 +2972,7 @@ void K_MoveKartPlayer(player_t *player, boolean onground)
 				player->mo->destscale = FRACUNIT;
 		}
 		else if (player->kartstuff[k_growshrinktimer] > 26
-			&& player->kartstuff[k_growshrinktimer] <= (itemtime - 25))
+			&& player->kartstuff[k_growshrinktimer] <= ((itemtime + TICRATE*2) - 25))
 			player->mo->destscale = FRACUNIT*3/2;
 		// Megashroom - Back to normal...
 		else if (player->kartstuff[k_growshrinktimer] > 1
diff --git a/src/p_saveg.c b/src/p_saveg.c
index 56250118..d715c2be 100644
--- a/src/p_saveg.c
+++ b/src/p_saveg.c
@@ -137,7 +137,7 @@ static void P_NetArchivePlayers(void)
 		for (j = 0; j < NUMPOWERS; j++)
 			WRITEUINT16(save_p, players[i].powers[j]);
 		for (j = 0; j < NUMKARTSTUFF; j++)
-			WRITEUINT16(save_p, players[i].kartstuff[j]);
+			WRITEINT32(save_p, players[i].kartstuff[j]);
 		for (j = 0; j < MAXPLAYERS; j++)
 			WRITEUINT8(save_p, players[i].collide[j]);
 
@@ -320,7 +320,7 @@ static void P_NetUnArchivePlayers(void)
 		for (j = 0; j < NUMPOWERS; j++)
 			players[i].powers[j] = READUINT16(save_p);
 		for (j = 0; j < NUMKARTSTUFF; j++)
-			players[i].kartstuff[j] = READUINT16(save_p);
+			players[i].kartstuff[j] = READINT32(save_p);
 		for (j = 0; j < MAXPLAYERS; j++)
 			players[i].collide[j] = (boolean)READUINT8(save_p);