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Just changed the shocks and sway bars on my 2013 C6 narrow body. Went from stock stuff to Z51 sways and Z06 shocks with a lot of engine work too. Car drives straight. The weight probably changed a little from removing the stock exhaust and adding LT's, non catted mids and Z06 mufflers. Do I need to have the alignment checked? The alignment was done 8 months and 3K miles ago.
If you put coilover shocks I would, only because the ride height would have changed, but I was not align it if they just replacements. Nothing has changed since shock manage the ride, but don't carry the load, unless they are coilovers.