you can check the crank pully by starting the car and looking at it, if it looks like its turning out of ballance then you have a problem.You can check the mounts visually from underneith look for things like cracking and splitting. you have to remove the sump to check big end bearings.

I have seen 3 wrxs with shagged crank pullies,when they are out of balance you can see it and feel it when driving

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Marti


Car: C Red S13 Silvia 2.3l 400+rwhp-SOLD
Daily ae82 4age corolla (light mods)-Sold
Daily:SWB GQ Patrol
Will be a 03-04 STI next