Dyno proof.
This engine left Opel Rüsselsheim factory in 1991 giving 115 CV/PS (= 113.5 BHP) & 170 Nm (= 125.5 lb.ft.) as standard.
In 2004, many years and many miles later, and well out of tune, I dynoed it with these poor results:
Just 107 CV (PS) = 105.5 BHP
Now, (with 16 years and 130.500 miles) after lots of tuning work plus grooved chambers, these are the results:
142 CV (PS) = 140 BHP
194 Nm = 143 lbs.ft.
Most definitely grooves do not harm :-) .
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