These are 5 inch thru hulls with GGB mufflers, I got a super deal on these many years ago, I just got a 4 to 5 inch exhaust tube from a diesel shop and used my standard 4 inch hose, if interested I will include them, they are not perfect but some elbow grease and they will look fine. The GGB mufflers are included they don’t make these anymore and I saw a thread on here from another company making similar ones and they were quite expensive, so how about 300.00 plus shipping