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I am sorry I know nothing about Dinitrol. But, I did find the engine a touch noisy when I first got it. Since then:
1. put it into eco mode. Much quieter.
2. Run it for 3 months/2600 miles, and it has got quieter.
3. Put in half a tank of 97 octane fuel (Bp ultimate)
and it now just hums along the road. I would certainly not be looking to spend money making it quieter.
 

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Discussion Starter · #3 ·
Dinitrol is meant to reduce some noise from the road (claimed double reduce). Car's bottom part is covered in it. It becomes like a rubbery material of ~3mm thick.
 
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