6G72 's ignition is bad in 6 ways.

i) 1 coil for 6 plugs, is adequate up to just 2500 rpm : above 2500, sparks=
 are too small for fast combustion. 2 camshafts mean 2 distributors can be =
used if needed, to use 2 coils.
ii) carbon core cables' resistances are too high : I fitted 7 lower impedan=
ce ( 1x3, 6x ~300, ohm ) cables, noise =E2=86=93, torque =E2=86=91.
iii) no capacitor fitted : I added just 44000 =C2=B5F, noise =E2=86=9350%, =
torque =E2=86=9110%. BMW & VW already have capacitors. My 4G15P has 0.6 F a=
dded, torque is ~40% more, if cables are tri core & 3 ohm each.
iv) distributor has no calibration*mark for timing : should have * embossed=
 on mounting bracket, so timing is clear & can be set w-o a timing light.
v) distributor cap is opaque : user cannot see whether cam shaft can move, =
or sparks inside.
vi) cap has no air intake pipe : user in humid air can connect a hose with =
silica gel onto this pipe to dry air sucked in. so sparks inside produce oz=
one to oxidise soot in engine & plugs, & produce more heat fr petrol.