A HUGE plus for these would be less engine compartment heat. Those primary cats won't be sitting there cooking everything. Removing the primaries and leaving the secondaries always made more sense to me. You lower engine compartment heat, but don't have the nasty smell of running catless by keeping the secondaries....Of course this is just speculation on my part. I am sure Rob will chime in and let us know all the bennies of the new downpipes.

Awesome!

Cheers,
KrzyFast