Aeromotive 340, Racetronix 340, DW300, Reds modified walbros, and a few others but arent as common. What is the ultimate horsepower goal? That double pumper you have is a good piece, really not that complicated, and will work for a street/race car well into the 10s and lower. When I changed out my aging walbro, I decided to go with a Racetronix 340 with hanger and sender all together. It was drop and go and I have had no issues yet. If I were to do it again, I would go with a double pumper to run e85 with piece of mind. With all of the above mentioned pumps, some members have had issues not being able to get fuel pressure low enough at idle due to return issues with the stock return line. Myself and others have had zero issues using stock lines for return. Just a heads up if you decide to go with one of these pumps. If I am not mistaken, the double pumpers and walbro style 255s do not have these issues.