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This seems interesting. I wish somebody had a DIY so that I knew exactly what I need to order all in one shot.
You can turn the volute while on the Vette it just will be tedious to a degreee -
Once in place you can take some measurements and do a mock up of the system, the nice thing is if you need a 3" Coupler 4" inches long you can buy the 6" coupler instead and have enough material should the measurement be off -
The prices are very good and the product is very good too!