When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I had a conversation a while back with a trickflow rep who swears up and down that pro products is a cheap knockoff and there is no comparison. He said the lack of quality control where pro-products are made is what makes them so poor of a product. But I didn't care much since trickflow was inexpensive and I liked the looks too.
The PP may be a clone, I doubt it though as with their both being US based companies an infringement suit would be a cake walk if were it true. For that matter if you spoke with a Pro Products' rep you might get the same story in reverse?
Nonetheless I have seen them side-by-side and in fact the Pro Products plenum has a bit better (smoother) casting surface and bore then the TF unit. Finer sand, better packed...