The demand for the Stage 4 2JZGTE TWIN TURBO High Flow kit is still strong and there is still no alternate option for a real 600hp twin sequential FULL kit.
The main drama is the manifold porting and all the options available to achieve 600-700hp. The full solid weeks labor and low price forced the cancellation of the kit until the problem of low income is sorted. But no affordable solution cold be found other than a price rice to it's REAL value or it's worth.
Being a very unique twin turbo system, in sequential, bolted to one of the best 6 cylinder engines ever made, and such an iconic car, the resale value of these cars has skyrocketed in price in recent years and trying to find a good original example of the MK 4 Supra is becoming near impossible and seem the only way to make any decent power is to trow away the Twins and fit a"done to death" single turbo which destroys the uniqueness of these cars and therefore the value.
BUT The Stage 4 kit has proven itself as a stock under bonnet appearance, twin turbo, REAL 700HP, 9 second quarter at 140mph, straight oem bolt on option which nothing exists like it world wide.
With the many components with the Stage 4 kit, to account for every restrictive part in the system, and the immense modifications to the stock parts, the price must be brought to a more realistic sustainable level to bring it up to what it value is really worth. This final price has been determined or not fully finalized but if the customer is will to pay the preliminary price then the Kit can be produced.
The final advertised price will be determined by what I can get alternatively in an equivalent time work doing other turbo high flow jobs. Currently the price is for a solid weeks intense work.
The latest option is improved Turbine wheels, Better flow Compressor housing, improved flow Compressor wheel, Better wastegate flow and control, and many other things. These upgrades are above the previous options which have shown 730rwhp and 9.6 second quarter mile.
Current development is looking into Stainless bigport manifold, 4 inch dump and a complete stage 5, all new components, 800+rwhp kit in sequential and look stock.
Plus a 2jzge twin turbo sequential, stock looking kit, to help the value of the GE cars. (saves changing the head to gte or the whole engine)
But R&D for a one man show on very limited budget and time will take some time unless funded or supported.