With all that extra piping and the gigantic size of those turbos, I think lag would be a very serious problem -- unless the turbos were firing sequentially (say, one at 3000 RPM and one at 6000 RPM). I don't even want to imagine the ECU hacking that would take to get working! There would definitely be serious heat issues under that bonnet, especially with that right-hand turbo... I can just imagine hitting the gas in that thing and having it go chug, chug, chug like a Civic until it reached 3600 RPM and then holyMOTHEROFTURBOSHEARMYPRAYER smoke burning from all four tires as the differentials shudder and the whole thing skates around like ball bearings on ice...

The other serious problem is that both turbos are feeding from the same intercooler -- that has got to cause strange air pressure problems. All the twin-turbo setups I have seen (which includes a 300ZX Fairlady, an audi TT and a twin-turboed Grand National) use two smaller intercoolers rather than one giant one. The 300ZX's TT setup is extremely logical and solid, with the turbos located near the back of the wheel well on each side (away from the cylinders and other components) and two small intercoolers, one inside each fender.

 

already done........... haha