Poly bushings will squeak/groan after a while, even if you lube them well. I used the entire tube of silicone grease included with mine when I installed it, but it still groans in colder ambient temperatures. It's a tradeoff of having those stiff poly bushings vs. the quieter, softer rubber ones.
Hatch Nation #90
'12 SE Sport 5Dr |╠╬╝|Sterling Grey Metallic|203a|Moonroof|17" Paint/Mach Whls|K&N 57S-4000|FFE RMM|Steeda STB, RSB|JBR bushings
'01 ZX3|╠╬╝|Pitch Black|Prem. pkg.|Moonroof|SVT Snorkel|SVT Springs|S2 Dampers|Steeda STS|Magnaflow exh.