The big limiter here, guys, is Neil wanting to keep the stock heater boxes. Talk of ANYTHING that makes more hp than the heater boxes can support is a waste of time, hence the combination I proposed above.
Stan Galat posted:
1-1/2” heater boxes are widely available and EMPI now has 1-5/8 boxes, so I wouldn’t let stock boxes limit me in any way.
Heat isn't a limiter anymore. I wouldn't run stock boxes on anything more than a 1600, but that's just me.