A good choice in colour Justin! Mine is also Sports Grey.
I too was mystified by the colour of the exhaust.
I would say that a polish with a Dremel and some autosol would bring it back to Silver. If that is if you want it.
Also a sleeve of an old sweat shirt wrapped round twice with autosol and some muscle power and patience will do the job.
This is a useful video.
https://www.youtube.com/watch?v=ajqNR6hTSwEI give the headers this treatment every now and again and with patience it works although soon returns to a straw colour. The Exhaust is a much lower temperature so should retain its brightness.
Interesting in this and associated videos its suggested that header discoloration is a form of corrosion caused by poor quality steel. I have always found it a natural reaction with both chrome plating and stainless irrespective of quality, if the material is taken to sufficient temperature in air, although material quality does effect the readiness for this to happen.
The colours yellow, straw, brown, purple, blue etc. represent increasing temperature colour indication used in tempering steel to different levels after hardening.
