Hi Paul,
Your manual CD must be later than Chris's one.
How yours are in the pics is where I had wanted to run them, just not real sure how much room would be left with exhaust fitted.
Here is the most the picture from build CD I have that shows routing in this area.
The pipes appear to "cut through" where in Chris's car`there is a square section chassis rail over the top of the area that the pass through.
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Cruising in 5th
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Never be afraid to do something new, Remember, Amateurs built the Ark: Professionals built the Titanic.