My Latest test data on the 58, using two tuned pipe header lengths on the MTW tuned pipe (the one for DA), MTW TD75 canister, KS canister, and the MVVS canister setup.

The 400mm long header sets up the tuned pipe engine in the sweet spot, the short 300mm header makes for a more finicky engine. Loads of power, but only with the right setup.
Edit:
I hope the picture explains all.
The MTW tuned pipe on the shorter 300mm header shows that the typical torque hump at 3/4 of best torque rpm enters the operating window of our props (5500 - 6500 rpm) A slightly shorter header might be even called for to take advantage of this.