Okay. Let's say you are exactly right and they do fit, then I'll be a happy camper.

Now I'm just curious why the manufacturer says that they won't. Hopefully whoever I get on the phone will be able to tell me.

Anyway, I'm encouraged and ready to start getting the car ready for a few weekends at the track:

Tokico D-Specs w/stock springs
EBC Yellowstuff pads
EBC sport rotors
Stainless steel brake lines
Hotchkis sways
Motul

Here is the reply from Tokico:

Thank you for contacting TOKICO. Do you have switches that control the shock for soft and firm? If not that is why we (exc. Sport Susp.) they are different.

First, it was nice of them to reply to my question.

Second, I'm guessing English is not the first language of the guy who replied. His name sounded.....Nordic.

Third, I think what he is trying to say is that for cars with in-car automatic shock adjustment, these shocks won't work. I was not aware that this was an option on an 06 G35 coupe. I suspect it isn't and it worries me a bit that Tokico doesn't know that.

Fourth, it sounds like the D-specs will fit my 06 6MT, just as you guys said. So tomorrow I'm off to the mechanic to find out how much it will cost to install them, the brakes, rotors, brake lines and antisway bars. (In the past, I'd do all of this myself, but in my current house I have no garage and my driveway is no place for jacking up a car.)

Why won't they work? I have D-Specs and they work fine!

You might want to give the 350Z Tein S-Techs and D-Specs a try. They work great together on the sedans without really lowering the car much.

lol they just don't know each one of the cars they produce products for well enough. There is no adjustable stock shocks and they will fit fine.

Sad if thats the case. You would think a lot of R&D would be done prior to marketing an item.

Prob is that people making them probably know, but they aren't the ones that market or do customer service.

No, the problem is still R&D. For a company like Tokico, I'm willing to bet the aftermarket products are based off of specs they used for the OEM products, which is fine for the most part. But companies like Tein really have no real R&D, and for them it's more of an estimate, make, install, drive around the block kind of deal.