Hi Almerians

I read quite a few post in LYN about the Almera being floaty / unstable when driven fast on highway. Some say even at 110kph it feels floaty. I don't expect it to perform like fast & furious as I know the Almera is built for comfort & not for speed & fast cornering. But to drive @ 110kph on a straight road and feel floaty seems quite odd to me. The design of a Nissan can't be that poor right ? 
I'm just wondering if anyone has experience an improvement after fitting a body kit eg maybe an Impul one or a 3rd party body kit ? I will be using my car for city drive with the occasional outstation drive a few times a year & also to the highways around Klang Valley.

Any feedback is appreciated.