Hey guys - I'm getting way ahead of myself on this, as exhaust upgrades are still probably at least a year away for me, but I'd like to get your opinions in advance. I've currently got the 2.5" axle-back SZ setup, as it was from the previous owner, but as I've looked at potential changes to the upstream components it seems foolish to not go for the 3".
SZ has 3" to 2.5" taper mid-pipes that would clearly work, and while I understand there's some flow loss in the step-down, I wonder if it would even be noticeable with the restriction at the turbo outlet mitigated with the 3" DPs. Sure, the obvious solution would be to just get the 3" axle backs... well, that's $700 that would be nice to avoid, especially since I've got some nice parts already in place.
For any who are curious, here's my high-level plan:
Phase I: Get it running "right" - misc deletes and maintenance: Spoiler replace, clutch bleed del, carbon can del, AIV del, EGR del (with engine in
), TB coolant lines del, antenna & rear wiper del (on the fence on those), etc., 120k, clutch. Clean the F out of the engine bay. Between now & through winter 2019.
Phase II: Flow - All exhaust, from the DPs down, including what I asked about above. Intercoolers and maybe the Goose Honk Killer (if not sooner). Pop charger is in, but who doesn't do the intake first... oh, wait... my Z's previous owner didn't (which was fine with me). Later 2019.
Phase III: Balls - Injectors, boost jets & tune. Winter 2020.
Phase IV: Bigger balls - TBD.
As always, gladly welcome your input & advice.