open vs unsilenced air cleaner
I'm sorry, i dont. I saw it a few years ago when motor trend allowed average joe nonsubscriber to see them on their app, a month or so after subscribers. They stopped doing that quite a while ago. You might find snippets of it on you tube.
Memory is all that i am going by, but i believe they tested 18 or 19 different a/c and filter setups on a 700hp big chevy. The best setup actually added hp, compared to no filter at all, the worst cost nearly 100 hp!
The mopar, with one snorkle blocked cost 50-70 hp (memory is fuzzy), opened up it still cost around 20hp (remember, this is on 700hp), and the flipped lid version only cost about 5hp.
Upshot of the episode was that airflow direction into the carb was more important than lack of restriction. The winners were all some form of a velocity stack. One of the biggest surprises (at least to me!) was that a k&n housing with a 3x14 filter, and a filter lid worked better (for hp anyway) with the 3x14 taped off, using just the lid. Flow directed down into the carb, not across the carb throats.
I wish i could see it again, but i dont subscribe to m/t on demand.
