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I will probably get flamed for this, but I think this is a pretty bad graph.
More than 500nm for less than 2000 rpm - useless for everything except pub figures.
The 0.82 A/R housing will already make it much better, but you need to change cam setup as well.
The cams are Catcams high lift/duration.
While tuning this car, the only limit was the fuel pump...if more fuel would have been available the guys probably would have gone up to 2,5 bar. But at 2,2 bar things started to get tricky on the fuel.
So how is this a stock head, if it has been ported and the cams are not stock?
This is not a stock head in that case.
It sounds like you have a good setup. If you want to constantly rev to 7.5k, you might want to look into doing some work on the valve train (unless that is also done in the "stock head" ).
Looking forward to seeing your car with fixed fuel problems, 0.82 A/R housing and more boost. I am sure you can easily break 600hp and get a much nicer power band.
Good luck.
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