currently on my 68 chevelle (327) I have spintech mufflers and the sound is pretty loud during cruising or up hills at a slow rpm. also have blown a couple head gaskets due to loosing header bolts. what would you fellas recommend for header bolts? I have seen those locking header bolts on summit are they any good to use? also looking at magna flow mufflers, how do you guys feel about running them or any other muffler with a classic muscle sound, but not making you deaf while your at cruise speeds? the last muffle shop got the exhaust pipe to close to the under carriage on passenger side and it vibrates at certain rpms tried to bend it down but just always returns, and now I am going to ceramic coated long tube hooker headers anyway, so figured would change all at this time. i also read that these coated headers need to go through several heat cycles before they fully cure. how short are the cycles? short drive or just sitting and idle until hot and turn off, so the metallic coating is not damage or discolored? benefit of running an x-pipe? will it make a noise reduction? if so maybe I will keep the spintech mufflers advice pls.
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