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Have you checked the rubber pads that sit on top of your coil's?
If they are warn out, it could explain the metal on metal noises.

No muffler is illegal but it does sound good and helps the exhaust gases get out a lot better.

Make sure you get a 3" dump pipe too so It's a true straight through exhaust.
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Hi mate Its quite easy to put a top mount on your 2.8, find your self a gu 2.8 intake manifold and intercooler bolt it on and plumb it up.

How big is your exhaust now mate? The intercooler and pipe work, with a boost controller (if you don't have one already) would be the go ..

Others should be able to offer comment on this one...

Everything bar the engine mechanical and electrical should be right.
I have attempted to get a manual that includes the RD28T, TB42E & RB30, but no luck yet.

Hmmm ... Until you said you'd had the caliper off, I would have thought a stone stuck in it or the guard ...

When you had the clippers out, did you take the pads out fully? Question being, we're...

There is a lot of information to put in here so this post/thread will keep growing over time, I'll add photos as I can.

This is by no means a complete or definitive guide, my aim is to give people...