Thereby, {TAIL ~ the combustion noise} radiated from the exhaust outlet is reduced for all the directions, and at the same time the combustion noise is reduced with a sufficient accuracy corresponding to variations of {HEAD ~ the combustion noise characteristics} 
Thereby , { TAIL ~ the combustion noise } radiated from the exhaust outlet is reduced for all the directions , and at the same time the combustion noise is reduced with a sufficient accuracy corresponding to variations of { HEAD ~ the combustion noise characteristics }
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD