In article ,
The Natural Philosopher wrote:
I suppose your point, that there are no appallingly BAD installations
these days that can be EASILY upgraded by SIMPLE changes is also valid.

Indeed. Yonks ago some engines - like say the Ford Zephyr - had an
appalling exhaust manifold which was just a straight pipe with holes for
the ports running along the cylinder head. And a single very small
downdraft carb. Changing to a well designed manifold and exhaust and
fitting twin SUs etc raised the BHP from about 80 to over 100.

stuffing 5 star in, being the case in point.

I've never seen it documented that changing to 5 star on an engine in
proper tune designed to run on 4 star has made any difference whatsoever.

--
*Give me ambiguity or give me something else.

Dave Plowman London SW
To e-mail, change noise into sound.