the 05-06 type S Midpipe (the b-pipe is what comes down from the header) is 2.25" and has a much deeper resonator.
He is saying that the spring bolts that came with the Megan exhaust werent able to be threaded into the type S midpipe. They are pre-threaded like our stock one, but the pitch pattern might have been different on the Megan axleback supplied bolts.
The Type S exhaust Header, Cat and Midpipe to stock EP3 axleback is a really good mod and a fairly cheap way to upgrade your exhaust to 2- 2.25"
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