Yes, what everybody else has mentioned can be the culprit. Free post 
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Mods:
Lots of crazy stuff
See the wing? BE the wing!
Drive my car? FEEL THE DOWNFORCE!!! ^_^
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1999 Civic Si
5psi T3/T4, 2 blown shocks, oil leak, rusty sway bar endlinks.
1999 CR-V Rusty rear fenders, Rusty Hood, broken exhaust baffle, 2 bad motor mounts,
2007 Honda CBR600RR, scratches.