These are some good kills, but I have driven and seen some FAST Supras out there that will put a hurtin' on ya...

I'm here in MA visiting my buddy who has 4 Supras in the garage 3 MKIV's and 1 MKIII (the Pinks winner)... The 'slow' MKIV only has a boost controller, exhaust and MT DR tires. It consistantly runs 11.7 - 12.0 1/4 mile. I'd have to guess these guys are closer to stock or have poor tuning skills.

Stock Supras ARE rated lower than the XF:
Jap spec @ ~ 276hp
US/Euro @ ~ 320hp

As far as turbo lag. The dual stock setup is not too bad as the small primary spools the secondary. The big single conv has a good deal of lag, but once it comes alive... bu-bye.

The 2 that I've driven this week:
The 87 MKIII (7M motor / not a 2Jz conv) - YouTube - 943
The 94 MKIV w/ single turbo conv - YouTube - First full gt42r pass 26lbs

BTW, we just strapped N2O on the blue one this weekend. A small burst from 32-4100 rpm to spool the turbo and a 100 shot on the top end. Felt really good on the street, can't wait to see what it does at the track now!