Not Ranked
The BDR slip joint has a design issue from the get go. Simply put the header pipes are not even remotely expanded to the right dimension. Mine were so bad, someone in a feable attempt put a tack on each pipe to prevent the pipes from rattling against each other not to mention the exhaust leak. Now that my slip fit is about "right" I understand dwdshelby comment about how difficult it is to get the header and side pipe together since they are not sloppy loose. I would bet the majority of BDR get with one of 3 engines 302, 351 or 427/8. Why not have 3 options and flange the connection.
There is no doubt BDR is by far the biggest bang for your buck yet they are still 35 -45 grand when complete, when talking this type of money flanged sidepipes should be offered as an option even if it would add cost.
I enjoy working on cars but to the guy who does not or bought a turnkey minus with the impression he would only perform routine maintenance the slip joint connection would be frustrating.
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