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I put a new exhaust system (http://www.melroseheaders.com/produc...ystems/c-4.php) on my L98 1989. I have recently noticed some backfireing. I have had the system on for about 6-8weeks but the problem hasn't been noticable until 1 week ago. I would say it backfires frequencly but not constantly. could this be bad gas?(I use 93 but i had to put Pride... only thing around me at the time) Or am i looking at something more complex.