a rise in tyre pressure will also help more with self centering ontop of toe out.
as for iva it says
With the vehicle at normal operating temperature, run the engine at ¾ of its ‘maximum power’ speed, and note the sound level reading obtained.
Note 1: Manufacturers drain holes are permitted in silencers
Note 2: The exhaust may have several outlets up to 300mm apart connected to the same silencer. In this instance the microphone must face the outlet closest to the vehicle contour or highest from the ground. In all other cases, separate measurements must be taken for each exhaust outlet; the highest value obtained is the test value.
Note 3: Where the engine maximum power speed is not available, the test may be carried out at 2/3 of engine maximum design speed.
i stated my engines max power speed in my iva application this speed is 5500rpm for my exact zetec model not 6800-7000 max design speed
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