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From what I have been able to find out they seem to work well from around 3,000 rpm onwards. How high is determined by the condition of your valve springs, exhaust etc. The idle quality is ordinary, with the stock ECU, & you will have to advance both cams quite a bit as it will probably idle...

Any downsides on using exhaust shield (header) wrapping on intake tubing that is exposed to high temperatures? What about wrapping a stack of aluminium foil around it, that should keep the heat away.

Yes very dissapointing that my new cams should have such variances especially as I paid almost as much for them as I did for the entire car.:3d_frown: Now I know why its impossible to find a clear large picture of these cams, covering the important sections, even though various people are...