If I read that quoted email correctly, the seller is shipping for free?? If that is the case, negative feedback is unwarranted. In reality today, shipping is the largest determining factor on most sales, hence why many outlets off free shipping.
While I do appreciate the free shipping, the cost of shipping was well offset by having to buy materials and tools to fab my own exhaust hanger, not to mention the evening lost to working on it. If a regular outlet had taken the same amount of response time, I would have expected at least a shipping discount to cover this. A forum is obviously not a retail store, but my assumption was more that the free shipping was due to the delay than it was due to promising items that were not delivered.
Also coming to his defense, he had 4 posts total, so he would have had PM issues with this forum, in my opinion the negative feedback was unjustified.
I can understand PM difficulties on forums, which is why I provided him with my phone number if texting was easier, as well as my email for PayPal. In addition, the seller did not state any issues with communication, only that they had forgotten their item was listed here. Again, understandable, but the more spotty communication continuing from that point is what I took more issue with.
If there had been just difficult communication and the seller had provided free shipping, this would have been positive feedback. If the seller had been up front about the item not including parts, I likely would have been alright with that. But that is why I specifically inquired as to whether or not it included the db killers, mounting bracket, hardware, and clamp - and it included only the db killers and 1/2 the hardware, no bracket, no clamp, and no heads up of "hey I stated X but now that I'm packing it I realized it's actually Y." As someone who works in online sales handling customers and product, that is negligence bordering on intent that is not excused through a shipping discount.