i have a bit of info on this, while at GMC john was explaining to me about how the ECU's were changed at around 2001. Before VTS had 120bhp on ECU 1
then VTS got a new map on ECU 1 pushing it up slightly to 130bhp
then VTS got new ecu(3pin type or sumthing) with same 130 map but with exhaust emissions thing on, bringing it down to 120bhp
Most X reg VTS are 130bhp, mine put 106bhp at wheels as strandard, normal is around 96bhp. Plus john took mine for a test drive and he said it was quicker than a standard.
hope that helps
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