Tuning a 2.8L C5
Then after that you gotta prepare for the suspension issues (control arms bushings, shocks, tie-rods etc).
Its just not feasible, unless one runs things at the very edge of tolerences - which affects something - durability, fuel consumption, oil dilution, detonation, etc.
BS.
If i'm wrong, please provide details. Else consider this myth busted.
G
Of course, you can also raise the RPMs dramatically - but this doesn;t, and can't. The motor won't take sustained higher revs.
G






