Grand Am Series
Join Date: Feb 2009
Location: Indianapolis, IN
You can drive with blown passenger mount forever. I didn't even check mine until I got really bad wheel hop under 'sprited' driving (I was at the track). Rear mount I'm not sure, but given its design I imagine you'd start to get some clunking. If you don't drive hard you might be good. But, given that both are really easy to replace (especially with all the walk throughs on this forum) seems like not doing it would just be... well, lazy!
I am the Stig... Corksport SRI, Sure Torq R3, Sure BSD, JBR short shift plate, Eibach Pros, Koni yellows, Hotchkiss rear sway, EBC Yellow Stuff, Hankook Ventus RS-3 (track)