I have a complete stock exhaust system on my truck (repro stock muffler). When I went to install the rear fording stack I found it did not line up with the tailpipe. It was off a good 2-3 inches!!! Anyone else come across this problem?????

I can't figure how to solve this without cutting and extending the tailpipe 2-3 inches to the rear. I muist be doing something wrong because it should just bolt straight up.