No this sounds really wierd. U need to take it to a really good mechanic I think. Unless your very experienced.
Is there an undercariage wash in the car wash? If so there might be a leak or crack in the body underneath the car.
Or the roof isn't sealing all the way in the rear.
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SCT Xcal III w. Bama 93 Race tune, K&N CAI,
Pypes mid pipe duals w. custom H, 3.73 pluss T-lok, DynoTune 75 shot wet nitrous
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Tokico D-spec Shocks/Struts, Eibach Pro-kit,
Steeda LCAs, LCA relocation brackets, Adj Pahard bar, Adj UCA, 18x9 Chrome FR500s wrapped NT05s in Fully sound deadened cabin 
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