Narrative:

Aircraft was modified with an stc engine change. During engine change the engine mount; between engine and firewall; was modified which was outside the stc specification. Further; exhaust system was installed incorrectly thus partially separating from engine cylinders in flight.

Google
 

Original NASA ASRS Text

Title: Cessna 175 pilot reported that the aircraft was removed from service due to maintenance issues that were not in compliance with FARs.

Narrative: Aircraft was modified with an STC engine change. During engine change the engine mount; between engine and firewall; was modified which was outside the STC specification. Further; exhaust system was installed incorrectly thus partially separating from engine cylinders in flight.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.