I think this is the first issue that I have seen posted publicly about IND. I am sure that if you give them a reasonable amount of time that the issue will be rectified, either with another exhaust or a refund.
From my dealings with IND they have been more concerned with the satisfaction of the customer than profit. I know of a few cases where they have lost money to make a customer happy, knowing they would make that small loss back in the future due to a good reputation and from referrals.
Please give them a chance to make it right and I know they will.
By the way, this post is due to the fact that IND has made me a satisfied customer many times over and I never hesitate to buy from them or recommend them to friends.
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