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FWIW, I doubt that you will find a muffler shop that can mandrel bend pipe. The equipment is extremely expensive and takes a lot of floor space.
That being said, lot of people believe that compression bending is not good for their car. While compression bending does reduce the diameter of tubing at the bends, most engines don't need a perfectly bent exhaust system. Real race cars that spend all of their lives above 6000RPM might need some wazoo system, but most of us are driving on the street, and the cost of mandrel bent parts FAR outweighs any benefit in power that might be seen by compression bending the pipes...
And (steps on soapbox), having been in the performance exhaust business for a long time, I am convinced that there are an awful lot of guys running around with a system that is way too large for their vehicle. No way does anyone need a 3" dual exhaust system for a 350 or 383 small block...It is a waste of money...I gurantee you that the driver could not t ell the dsifference in performance if I swapped in a 2 1/2" system when he wasn't looking...
On your 267, I would certainly not recommend anything over 2 1/4"
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