Pete here's the pics you requested yesterday. Note that they are both made by HM headers. The 4into1's are built by ford specs and the other by HM. The 4 into 1's the primary pipes are too big (42mm i think from memory) which slows down the air speed and make you lose some bottom end. The cats are also to close. The 4-2-1's have a smaller primary i think it was 38mm or something i'll have to measure it. But there is still no restriction, faster air speed through the pipe which creates a larger vacuum. They give you more low and mid range. I also got better fuel efficiency and a better exhaust note. Dyno results will be posted in a week or two.
Pete,
Those headers there are the same ones for the AU. I'm not sure what the rest of HM system is like. I think it has one muffler and one resonator. I have spoken to the guys at HM a bit over the past week or so and they know their stuff, i'm sure if you get their complete system it will perform...
Mick,
If you dont have a digital camera, i can scan the photo's and post them up for you. I going to come see you tonight anyways....
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