So Lee's must just be the exception that proves the rule , as his made 605bhp on normal Super unleaded and has been maxed out at Bruntingthorpe without issue . Albeit only achieving a piffling 177mph* (due to 3.9 gearing), but it was revving to just under 8000rpm* at that point .

So to concure, I TOTALLY AND UTTERLY DISAGREE .

*Which incidentally is higher speed and revs than Ade's achieved before his let go, so something else needs to be considered as the problem IMO .

PS. Aren't you ignoring your own advice then You say 550bhp is safe limit for 2wd manifold, yet claiming to be running 570bhp with your one - something smells funny - aaaah yes, it's BULLSHIT