stall or not to all?

Cheap converters never work out, either stay stock, or wait until you can get the bucks to do it right. Been there, done that. Have the red oil stained t-shirts. It's too much work to swap and way too important, if not the MOST important part of a combination.

Don't **** around.

That being said. Factory hi-stall is available from gopnh.com. Great prices.