With the bypass pipes you'll get a bit more power, and the loss of 15 or so pounds isn't bad, either.
Yes, indeed, most muffler shops can build a set of bypass pipes for a lot cheaper than $400+ bucks. However, some won't do it b/c of laws about altering the emissions equipment.
FWIW, the pipes that Vertex et.al. advertise for $400 are a high grade stainless steel. If you find a muffler shop using the same grade stainless with bends done on a mandrel, you're gonna still pay around $400.
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