What's the smallest/biggest size of the exhaust housing on those?
Are there any bigger VTG-turbos from Holset and what's the size of those exhaust houses? Need something thats from approximately 9-10 up to 24 (as the he351ve). Or are the exhaust interchangeable so i can use a compressor from say a 431 and the exhaust housing from a 351?
Would like 1000hp on a inline 4cyl 2.3 engine

Without turbolag...
...impossible? No, not when God invented Holset VTG
The HE551V. Approx 9-31cm^2
~71-72 mm compressor inducer.
More information here.
http://www.turbotalk.org/bb/viewtopic.php?f=25&t=227You will definitely still have alot of lag, just less than a non VGT turbo. There is only so much energy available at a given RPM on a given engine. The VGT allows you to use it more efficiently, but it still takes a lot of energy to spin a large compressor.