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I have done the WL subframe inserts and they are the only upgrade so far and they do induce more noise in the cabin while driving. Exhaust is also stock, so there is no drowning of the noise the inserts generate.
No added harshness or vibration.
There must be a reason why STI added only upper ones on the BRZ STI.
A good combo maybe STI upper (front ones only) and member brace to minimise all noise may have almost the same effects?
One thing though, the rear definitely feels so much better with the inserts, at the cost of some understeer, very much planted and more grip on tap.
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