Remove the exhaust hangers, grease up, replace
If you can't get them off (I could only get the rear one off)
Just prod as much grease in them as you can, after a while it works its way in
That was my squeak anyway
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407BHP and 340lbft
TD GT28/32 hybrid turbo, 3inch decat, 2.75inch exhaust, air intake + large MAF, injectors, fuel pump, tubular manifold