So I'm literally a day or two away from ordering one of these + the 13" Stoptech kit.

The flex have nutty spring rates, but the EDFC should help. I do autocross about 15 times a year, but the G is also a daily driver. The JIC are harder to adjust, but the spring rates are less mental.

What about the Flex, but with maybe a 590lb spring on the front instead of the 672lb? Anybody have the newer flex with 672 all 'round? How are they on the street? My 05 6MT w/sport package has stiffer springs than the 04's, but I don't know by how much, nor any info on the sway bars.

Just not sure of how bad flex would be on the street, as I can't find anyone local with that setup. Any opinions welcomed, I'm leaning towards the flex.

 

I would go with the flex, the EDFC is very cool.

 

Do a search. There are a few people on here who are running the Flex set up.

If you're not interested in the USDM Flex with 671 lb inch rates, you could always get the JDM Flex set up with 560 lb inch spring rates.

 

Oh, I've searched plenty, read at least 50 posts here and at my350z. Nobody seems to specifically state if the ride is harsh, just lots of spring rate speculation.

Lots of "JIC is harsher than flex" and "JIC is more track oriented, flex is streetable", but that was back in the old days when flex had same rates as JIC (560lb). Now that flex has 672, it must be crazy stiff. I wish someone local had it so I could take a test ride.

Also, 350z JIC has 672lb in the rear, lots of "avoid" posts - 672 all around must be worse?

JDM flex is gray market, so no warranty or support - I might get some springs from Tein and redo them.

Back on topic, anyone can give a first hand review of either setup, specifically in terms of streetability?