Copper Dart, If you have no problem with the 1407 then I would keep it! My 1411 problems were addressed with larger pump Nozzles and different jets, rods and springs. After a couple of weeks of careful tracking and monitoring my 1411 was tuned to the point where my 440 was pretty happy. I was about to disconnect the O2 sensor and call it a day!

HOWEVER even as happy as I was, last night I sold my 1411 on Ebay for $270 since it was essentially 3 weeks old and I bought an Performer Series EPS 800 cfm from a local parts store for $399. The different of $129 is just slightly more than I spent on the Nozzle kit and jet and rod kit so in my humble opinion, the 800 is a far better deal anyway since the drivability goes through the ROOF the cost difference is negligible.

I think I mentioned earlier that I bought a 800 AVS but that is not correct. I bought the 1413 Performer Series EPS 800 cfm. It looks exactly the same but works like a true champion ALMOST out of the box.