I just installed a set of mac longtubes on my 347. I know that some people dont agree to wrap the headers but it seemed to me that it would be worth the risk to keep some heat out from under the hood. They have been a real pain in the *** to install but its my first time to put on longtubes so they all may be that way. And yes, the htc coating is sh*t but the header wrap from Summit came with its own silicone htp good up to 2100 deg. Hope it works ok. Ill let ya know.
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