Ok i have a usa built 1998 camry le 4cyl. I have slight mods including a custom cold air intake. and some NGK wires. it seems like on the highway my car will hit about 4100 RPM shifting into over drive and then after about a half second the RPMS will drop to about 3900 or a little more i'm just wondering if this is common. Also my car seems to top out at about 105mph is that common?