Brand new in the box OS 160 with new stock muffler and new Bisson inverted pitts style muffler. Satisfaction is guaranteed 100%. If it isn't what I say it is, I'll send you a refund and you can keep the engine. Packing, shipping, and Paypal fees are the buyer's responsibility. Avoid paying $375 at Tower Hobbies and save yourself $100 right off the back. Any other questions, just ask.