[Dimman]

Originally Posted by Ryephile

It's possible Formula 1 are currently using multi-wall tubing in conjunction with merging the exhaust valve ports in the first few inches of the primary tubing, then what appears to be a step another several inches later...however it's possibly a Helmholtz resonator using the multiple-walls as tuning forks. It's also possible that it's a simple step-primary and the delta versus straight diameter primaries nets a marginal gain solely at crazy high RPM [i.e. not relevant for road cars]. Any gain in F1, however, is worth the cost.

For us, it's rather academic and not terribly practical. Having Burns hash out the design with their software is likely going to get us much further than the OEM setup, and further than the usual hack aftermarket offerings.

Moar bigger = moar powah!