Tom, if ya haven't already do so, and you remain too curious, map out the exhaust pulses in a timing train; spoiler alert the Tri-Y being key for physical real implementation and pulse order.
Then see how DS and PS are equally satisfied.
For me, the In-pipe exhaust Speed for Primaries still conclude that 29" (port to Collector) is a good compromise for wideband with 1 7//8.
Collector design seems to be keyed to the compression (balance anti-reversion with EGR) and driving application (boost at rpm, i picked my 3900 rpm converter flash)
|