A friend of mine is running 16v+t redblock @700PS+ with 2,5 cat back and as he checked - exhaust is not a restriction here so I would rather think about header flow and hot side of turbo to be restriction here.
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'88 740 B230FT/531 header 38/46 valves, D cam + adj cam wheel, td04hl16t@20T cnc + 9blades exhaust, 440cm3 injectors 3" dp + 2,5" exhaust, easyecu3+ standalone, 302mm brakes, 18" pegasus wheels, rear louvre, 91' rear lamps, quad front headlights.
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