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If I change the stock exhaust system on my truck, will it lead to any kind of power issues or major difference in fuel consumption? I would like to install the Flo pro down pipe back systems (https://www.bcdiesel.ca/en/down-pipe-back-4-systems-3). Can somebody tell me which are the other good models? My vehicle is 2001 model GMC Duramax LB7. Thank you
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