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found this, Thort it may be of interest

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I'll tell you what would interest me...

Run a red motor on a dyno and test a set of extractors against the cast iron headers and see what the HP difference is.

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Disclaimer :- The above is purely speculation and is only posted for entertainment purposes!!!

So imagine they would have a choke pipe too.
There is also a difference the engine pipes between HD HR X2, HD has two pipes into a two into one muffler under front seat & the HR has a two into one pipe at around about where the starter motor is.

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HOLDEN DOCTOR

MY HR Ute had the cast headers with the two into one pipe at around about where the starter motor was. We modified the triple su manifold to suit the headers. was told by the old bloke(who had a HD x2 in a EH) they were better then extractors, as a young fella i didn't know at the time.
MY Question is, whats the diff with the longer pipe on the HD and the short pipe on the HR ?

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"just my 2cents worth"

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This will take You to" Old Holden sheds"
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Can't find any HR pipes but these are HD engine pipes & are 2 separate pipes that go into 1 muffler.
HR have 2 small pipes into a collector near the starter motor.

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Those longer pipes look interesting.

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