While surfing the net I came across this company's website, called MRZ Performance and found some hard to find parts (as far as I know). I saw some threads about FFP having billet dogbones and underdrive pulley but don't offer them anymore. I'm not sure if they have them for our car specifically but sounds like they do or could make them. I will inquire for the dogbones as I am quite interested.
http://www.mrzperformance.com/en/parts-accessories (http://www.mrzperformance.com/en/parts-accessories)
(http://www.mrzperformance.com/images/parts/16-billet-polyurethane-dogbone-engine-mount--gm-v6-and-4cyl--580x435.jpg)
(http://www.mrzperformance.com/images/parts/24-underdrive-pulley--310034002831-v6-580x435.jpg)
They also have 60mm Throttle body
http://www.mrzperformance.com/en/parts-accessories/big-bore-throttle-body/mrz-big-bore-throttle-body-60mm-3100-3400-v6 (http://www.mrzperformance.com/en/parts-accessories/big-bore-throttle-body/mrz-big-bore-throttle-body-60mm-3100-3400-v6)
They seems interested in GM vehicles as there are quite a few parts for them. They have polished front strut bar AND rear strut bar for J- & L-body, so possibly they could make or adapt one for W-bodies if they have a large enough request...
Im def considering the 60mm throttle body very soon. i might actually order it next week. I think the plenum just needs to be modified for the bigger tb
I just read someones post on these, saying that they are real hard, making the engine vibrations more noticable. but non the less since FFP stop production, we have to get these some place. Definitly a no, on the underdrive pully, However thank you for posting this AD, I can't believe they still make those 60mm TB's.
And the person that got them would be me. I ordered these and will give you some thoughts. First off the company itself is a really great place to deal with, they were straight forward, kept me informed, and shipped it quick. I have some pics of it installed but have to figure out how to post them. Also as stated, the vibration is quite a bit more. Inside the car it sounds like almost a drag car with a real lobing cam if that makes any sense. I replaced the lower motor mount at the same time too. The things do work though to get a lot more power to the ground, the car is a lot faster off the line now. Overall, if you want a really great performing dogbone, then they are for you, if you want a more quite OEM type ride they are not for you. Hope that helps.
I just put some stock ones on my car from Rockauto. $5.04 a piece. Can't beat that.
Ive got the FFP underdrive and the billet dogbones and I think that when you put more than stock power down these are well worth the cost. I cant speak for MRZ as I havent bought from them yet but I am prepping my plenum for the 60mm tb. When I get this I will report my findings
I just want to add, i installed huge washers on each side of the dogbone mount ( 4 total for each) ... i must say the motor doesnt move one bit ,and i must say the turbo im using hits pretty hard!
I never got a reply from my inquiry, but I did find this http://mrzperformance.vstore.ca/product_info.php/products_id/161 (http://mrzperformance.vstore.ca/product_info.php/products_id/161)
Thanks for the feedback emncfi
Adding big washers would probably keep them stiff. Mine would need to be painted though as they already have surface rust and the billet one's would look pretty good!