Specs: Description: Muffler Replaces OEM Numbers: Stihl: 4238 140 0611 Compatible With/Replacement For: Stihl: TS410 and TS420 1 year warranty ensures reliability and performance for every part. We’re confident that our products will work flawlessly, but in a rare case that it does not, we’ll replace it anytime within one year of your order. branded parts are trusted by professional dealers to perform OEM quality repairs. The name is featured on all Genuine product packaging.