|bearing T-Rods and the FUCA with same. I had a near complete aftermarket add-on setup, which was simply too hard for my driving style. So I removed each part in sequential order; driving a few weeks to ascertain the effects of the parts I had been using. T-rods and FUCA were the worst because of their metal to metal bearing/ bushing contact.
In the rear, the big offender was the AL subframe spacers we used to take up the slack. The poly diff bushing was more an issue of loudness than impact harshness. Could hear/feel the diff up through the shifter cutout in console.
The only coilovers I'd consider for street use are KW Variant 3; but at $2300 I'm going to pass until I win the lottery.