Yeah, the original style Pypes had were smaller (I have a set sitting around somewhere). About 1-2 yrs ago they came out with ones that were really close to the stock ones, if not exact.
The new version is dimensionally correct to the oem tips except the inlet is slightly larger than 3" so they will slip over 3" pipes. The T304 stainless is also a thinner gauge then cold steel. Since the outlet size is oval, the volume is the equivilent to 3". There would be no flow restriction.
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