Used exhaust adapters. Same as these ones from SOS $125 + shipping You will need to purchase the crush washers and bolts.
http://scienceofspeed.com/products/exhaust_airflow_products/NSX/ScienceofSpeed/exhaust_adaptors/
http://scienceofspeed.com/products/exhaust_airflow_products/NSX/ScienceofSpeed/exhaust_adaptors/
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