I got a pro tech 4-2-1 on my vtr £175 on ebay here is how i see it you are already starting with your torque low down on a vtr and your never really going to make it into a car with high end torque like the vts has so why not work with the tools you have been givin and work on acceleration as apose to going for a 4-1 manifold and increase your power higher up the rev range by the time you get to this hi end revs you are losing most of you power curve anyway as you only have 8 valves, the power on my mk1 vtr comes really low in the revs its around 2500rpm and starts to fade around 6-6500rpm, i would work on this mate.
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