The Fix for this are the Infiniti Q70 axles as they are better are more heavy duty and sturdy than the Q50 axles. most people that go low have issues but immediately swap over to the Infiniti Q70 axles. Also RSR has been known to drop lower than what listed and to me there no a perform spring at all but just for looks. The Swift springs are where it’s at and by far the best for performance and daily driving with no issues and have a great ride that I would say is comparable to some good coils. Swift is also the best in the game when it comes to springs.

 

Infiniti Q50 AWD Front Axle Upgrade Kit

www.z1motorsports.com

I replaced mine with these. No luck

 

if you go the coilover route, please spend a bit more and get the RSR coilovers.

I have had mine for maybe 45,000 trouble free miles.

Do you already have adjustable front and rear control arms? you will need them.

 

I dont have them, my front camber is at -1.9 degrees do you think that could be why its vibrating.

 

My AWD is on RSR down springs with DDS suspension. It's ok. No vibrations but I think my rear shocks are on their way out so I too am considering BC coils for daily driving. I want a very small drop so I don't need to buy adjustable control arms. RSR coils would be my first choice to retain the DDS functionality but I am too tight to spend that money on my 8 year old Q. If they were 1k less, then I would be more tempted.

For your current issue, I would refit the OEM springs to your car and see if the vibration goes away. It would be a PIA, but if you then get coils, you can start at full height, and progressively lower them over time until you get the vibration, and then back off and raise the car to the previous non-vibration height and all should be good? Either way good luck.

 

Think that’s what I’m gonna do

 

still don't understand where the performance/lowering STRUTS are for AWD cars.... haven't seen one set out there

 

I dont believe they exist.

if you really want a set, you may be able to use koni inserts.

you are just better off with coilovers...yes RSR for AWD.