http://autospeed.drive.com.au/cms/A_108185/article.html

Thought i'd put this up after the interest in the intake they previously did on there EF Falcoona.
Another score for the Ford design crew, verdict on measuring the stocko exhaust back pressure is that like the air intake, it's not bad for factory.

and if you want to see the whole article and not have to pay click here:
http://72.14.253.104/search?q=cache:I4w ... cd=2&gl=au

you can view almost any autospeed article for free by using google.
underneath the search results click on the word "cached"

it will bring up the full version of the file that google has stored for searching purposes.
this also works well for dead links, just click on "cached" instead!