DUB-213 Exhaust Extension 6" PDF Print $7.28 SKU: DUB-213 DUB-213 Exhaust Extension 6" Add to Wishlist Add to Compare Back to: Du-Bro Products Description Custom make your own muffler extension. Will fit most engines .29 to .80 and most mufflers. This stock can be cut, drilled, tapped, and welded. Comes 1 per package. Dimensions