It has to be remembered that D2 D3 D4 D5 etc is NOT an engine type , but a power range for example a D3 may range from 136 bhp to 150 bhp for example .. and D5 may range from 160 to 2130 bhp for example .. That is how the system works ..
The Turbo petrol designation system works in the same way ..and uses the same power ranges ... but T3 T4 T5 T6 etc
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 My comments are only based on my opinions and vast experience .
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