100 cfm more with anular and downleg boosters can't beat AFR

When there is shrouding effect it can been seen when reading the plugs. I used to index the plugs all the time. Did it help? Maybe. The stock elim guy who mentored me was convinced it did - and stock elim is all about squeezing tenths and hundreths out of an engine. I also experimented with notching the straps. But I think all that did was provide more sharp edges for the initial jump.