1500 miles sled is very straight. Tunnel is straight as an arrow. New pistons put in at 1100 miles. Just to be safe. No engine failure. All looked good. Pretty much bone stock. Had a can on it but it is off now. Track I. Perfect shape. Does have some venting. This sled is nice. Just bought a new one. Always been in enclosed trailer. Bought from Carl's has Carl's clutching. Runs great. Ready to go. 5200 firm. I live in nampa id