The exhaust temps in the rear of the fuse will begin to heat up and blister the fiberglass. There needs to be enough cooling air to flow around the turbine and mix with the exhaust in the rear to keep the surrounding area cool. That inlet will not let enough air around the turbine. I will try and post a pic tonight Jack. Simple fix, since the inlet is cut flush with the bulkhead all he has to do is remove some of the top of the inlet and it will be fine. I would also line the fuse near the exhaust with ceramic blanket or metal tape.