Powder coat is baked at 400 degrees so the back end of the exhaust should be fine, near the manifolds would require high temp powder which is hard to source & spendy but the tips shouldn't get over 200 degrees which is easily within the abilities of regular powder..... Like I mentioned powder will cover, you can be spraying the face of a part & the material that oversprays the edge will attach itself to the rear of the part.... Durability wise Gloss is usually better...