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I was hearing so many recommendations about what Flowmaster Series to use. I've read how some guys have used 40's and some 50's. I even called 2 muffler shops and got 2 different recommendations - one suggested a Series 60 and 2nd muffler shop suggested Series 50. Needless to say I was confused. I finally called Flowmaster's Tech line 1-800-544-4761 and they recommended the Series 50. I figured who would know best...
Anyway I love my new muffler, easy 10+ horsepower gain!!!
If you already have 6 contacts on each of your aftermarket tail lights then it would sound to me that they may not be wired properly. Take your time and simply compare the wiring to your stock tail lights. You may be able to correct yourself this way.
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