My understanding is that Allard no longer make the pipe. I may be wrong as it is only what I have picked up from other threads on A2OCWell, not really. There simply is no need for this mod on the BHC and ATL engines. From my post above...
Anyone with a BHC/ATL engine wantig to get rid of the obstruction presented by the EGR valve's internals has always been able to do so. Companies like Allard make a simple straight-through pipe to replace the EGR, as fitted by many members here.
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