I really hope its not one of the Pypes products where those geniuses had the O2 bungs facing straight down. Pypes has their stuff made out of cheap stainless steel somewhere in the swamps of China. Now I know a LOT of stuff is made in China (actually most stuff it seems) but the Pypes stuff is especially notorious for having fitment and quality issues.
With that said, you might have a pipe that fits perfectly and have 0 issues and even if you have problems it isn't something a local shop can't fix cheaply.
2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.