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AFAIK, the 8th gen Impalas only ever came with one of two suspension systems: The FE1 touring suspension and FE3 sport suspension. From 2006 to 2007, the LS, LT and LTZ came with the softer, more comfortable FE1 suspension and 16 or 17 inch rims while the SS came with the FE3 sports suspension and 18 inch rims. From 2008 onwards, the LTZ was given the FE3 sports suspension and 18 inch rims while the LS and LT continued with the FE1 suspension.

IIRC, the Taxi and Police package suspensions are the only ones which will give you issues when going up to 18's due to longer travel, but I could be wrong on that. Someone who is more familiar with the subject might like to chime in.

Hope this helps.
 
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