The only twin turbo upgrade I see from HKS for the Supra is a pair of GT2835s. Thats good for about 800-830 Crank HorsePower. Everything else they make is for a single T51R, T51K, or T04Z

 

I think you can get the HKS 30XX.

http://suprastore.com/hksgt30twint.html

 

Thats not an HKS kit per say. That was put together by the Supra Store and started life as HKS GT2835 kit. But for Sale price: $11,850.00 I wouldn't take that over any big single. If I was going to spend $12,000 on that kit I would do the following instead:

Turbonetics GT-K 1000 $2000
Turbonetics Cast Ductile Exhaust Manifold for big single: $645
Turbonetics Newgen wastegate: $726
3.5" or 4" downpipe for kit can be fabbed up for cheap but being expensive: $450
4" charge piping being expensive again: $450
Oil line: $20
Turbonetics Godzilla BOV: $365
Spearco Intercooler Upgrade: $1275 (it comes with charge piping and a Raptor BOV but lets say we can't use it)
For all that which is already more then that twin kit you're at $5,931. I could still get injectors, an AEM EMS, a triple fuel pump assembly and full fuel system rework, HKS DLI, exhaust and some other stuff and still be under the cost of that twin kit. But I digress..

 

Thats fine and I personally wouldnt go the twin route with a supra either, but Zilvia asked if there are any twins supras running big power. So i showed a link of a twin kit for a supra capable of more power then he asked. I said it was an HKS kit, I didn't mean just produced by HKS. I mainly meant a kit that used their turbos.

 

I like the big nasty singles for for drag racing, and the upgraded twins for road racing, or a broader power band. Most Supra guys are building their engines for big top-end power....so they choose a larger single turbo. As a result, they are slow spooling, and gutless below 4500-5000rpm.

When I was in Panama for tuning, I had the opportunity to drive an AAP built Supra with a GT42R, making about 750whp at 18psi, running a Motec. Fast car, but spooled slow. It was a different feeling, but from 5500rpm to 8000rpm, it was scarey fast, and sounded amazing. We hit the "freeway" which was actually a toll road. I was told that if I get pulled over, just hand the guy my passport and $20, and we'd be on our way again!! My kind of country.

 

There are quite a few Supra's making in excess of 800RWHP with Twin's. There are a couple of kits available and both HKS and Greddy manifolds are available as a seperate unit. The HKS kits is rediculously expensive becasue of the turbos which HKS Japan has designed and built based on Garrett frames. GT2835's and 3037's will make 800+. GT3240's will make over 1000. Saad Saad's Supra made 1200 irrc with 3540's. The benefit to any twin is that spool is quicker then with a single. Most of this is at 28+ PSI though.