I had no choice in the matter really. My OEM ignition system would not fire reliably under boost at heavy loads. Once I installed the Crane HI-6 unit, I get reliable ignition performance, even at 1.25bar of boost. Couldn't be happier. It even allows me to run a larger than stock plug gap. Stock is 0.024", whilst I now run ~0.030"-0.032" with the Crane CDI unit 
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Merv
'89 911 Turbo Cab
Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
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