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You can leave them wrapped NoDohc, 321 stainless is some very tough stuff. I personally ran my n/a 3 rotor with wrapped headers for over a year. Un- wrapped we have have ran our headers on my daily driver for over 4 years with thousands of dyno pulls, racing, snow, ice and rain. Never once failed or cracked.
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DEFINED AUTOWORKS
Where concept meets results
Black 1994 FD 4-rotor 610rwhp all motor
Red 1970 Mazda R-100 with 10a
Black 1974 Mazda Rx4
Black 1984 Gsl-SE 13b-re streetport 230rwhp
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