What happens if you dont replace strut mounts?
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u asshat! u hijacked my thread! :P Nah, just jk. 
will try out the suggestions, thanks. although, i am very sure the sound came from the rear driver's side. will report back with result in future.

No, they won't fix for free.
What modifications do you have on your car?
Since you say you have Perrin endlinks, check the tightness of the bolts with a wrench. Most aftermarket endlinks have some gap between the bolt and sleeve and if not tight, they will make a "clack" noice as the metal bangs against each other.
A "clunk" is usually heard on the front sway bar as it shifts left/right
Check the tightness of the 3 bolts on the top hats (mount). Just tightenly LIGHTLY (like 12 ft/lbs or something) because too much torque will snap the bolts off.
Take a look at the strut tops yourself... get in the trunk, undo the 3 bolts, take off the dust covers and look at the center where the strut connects to the hat. If it really is the hat, then chances are you should be able to see it.
Also make sure your wheel lugs are not loose.
What modifications do you have on your car?
Since you say you have Perrin endlinks, check the tightness of the bolts with a wrench. Most aftermarket endlinks have some gap between the bolt and sleeve and if not tight, they will make a "clack" noice as the metal bangs against each other.
A "clunk" is usually heard on the front sway bar as it shifts left/right
Check the tightness of the 3 bolts on the top hats (mount). Just tightenly LIGHTLY (like 12 ft/lbs or something) because too much torque will snap the bolts off.
Take a look at the strut tops yourself... get in the trunk, undo the 3 bolts, take off the dust covers and look at the center where the strut connects to the hat. If it really is the hat, then chances are you should be able to see it.
Also make sure your wheel lugs are not loose.
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anyways i got HELIX dna coils...no camber plates..it only clunks on the rear everytime i make a turn... checked the swaybars, endlinks, arms etc and nothing...
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it is the dealer in Capitol Subaru
I am not sure about the sway bar. Need to check on that.
I do have perrin endlinks. Not sure which is the cause.
I wonder if I can have the dealer change the strut mount, and if it doesn't fix the clunk noise, they have to fix it for free?
I am not sure about the sway bar. Need to check on that.
I do have perrin endlinks. Not sure which is the cause.
I wonder if I can have the dealer change the strut mount, and if it doesn't fix the clunk noise, they have to fix it for free?

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i have a 05 wrx. stock struts with tein springs. miles are ~40k
so, you guys are saying that its not possible for top mounts to make clunking noise? Or am I understanding it wrong?
The dealer specifically told me the mounts are bad, and said the struts are still ok. I guess I have to take it for a second opinion. The second opinion is going to cost me at least $100 though
so, you guys are saying that its not possible for top mounts to make clunking noise? Or am I understanding it wrong?
The dealer specifically told me the mounts are bad, and said the struts are still ok. I guess I have to take it for a second opinion. The second opinion is going to cost me at least $100 though

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^^That.
How did the dealer determine that your struts are still okay? Did the tech push down on the rear bumper and go "yeah, those struts are still okay" or did he remove the struts and check to make sure they still rebound properly?
Stan
How did the dealer determine that your struts are still okay? Did the tech push down on the rear bumper and go "yeah, those struts are still okay" or did he remove the struts and check to make sure they still rebound properly?
Stan
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