306 gti manifold

[C.A.R.]

Matt brings up a good point actually that's very easy to forget. The water pipes on the 1.8 are a different shape to those on a GTi6 and actually touch the manifold. There are a few solutions, you could fit GTi6 water pipes (bit of a PITA), you could cable-tie the heater pipes away from the manifold (surprisingly effective!) Or heat-wrap the heater pipes.

The GTi6 also has a piece of tinfoil (ok, it's a heatshield) protecting the brake lines / bulkhead from the manifold heat.