I think it may be about the length of the exhaust outwards from the beaver panel/ or corner if you have it diagonal. MY HJ Wagon never let in fumes with its old rusted pipe that stuck out about 8 inches and bent in a rusted out fashion to the passenger side - 202 in those days (used to cruise interstate with the rear widow open in summer no probs). When I put on a two inch extracted system off another wagon, the end of the pipe then sat pretty much level with the tail edge of the rear bumber, doesnt blacken the bumper, but with the tailgate widow down, exhaust fumes are enough to cause passengers to complain. Which is good, becuase it stops me doing it, CO1 makes you sleeepy... and er'm... also kills ya pretty quick and easy through respiritory ingestion!!! I think its logically probably a case of getting the exhuast pipe to extend as far beyond the rear of the car as possible, or if you go for a side port behind the rear wheels (where that is legal- dunno if it's not though) as you design it to flow the gas away hmmn - anyone got a wind tunnel?
Better still, are there any members who have no exhaust emmissions in the cabin with the tail gate open, (no fan on) and who would like to contribute a picture of their exhaust placement? This could be a really useful thread.
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