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And the factory exhaust has thermal shielding back along the pipes before the 2nd cats. It isn't there for performance reasons it is there to try and keep heat away from the axle/wheel area. I suppose you could try this stuff, but how would you know if it made any difference? dyno your car before and after? temperature probes positioned all around the engine bay? I'm of the opinion that as long as the heat from the headers/exhaust isn't hurting anything (like melting a brake hose, etc.) then there isn't a reason to do it other than precautionary, not performance related.
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