RGK20m3 Posted February 18 Share Posted February 18 Anyone know if the lower plenum and trumpets are the same between these? The upper plenum is of consistent height on the 4.0, which probably would allow the trumpets to all be the same height. Thinking of putting a 4.0 upper on a 3.9 lower, just wondering why LR made the 4.0 different. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted February 18 Share Posted February 18 I believe they are drilled slightly differently, but otherwise will bolt together, in fact I think the Gems will even bolt to a 3.9 inlet. Quote Link to comment Share on other sites More sharing options...
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