Stock Catback Limitations with Upgraded Turbos + Fuel + E85 Race Tune?

[DangerBrave]

Hello,

Ask: How limiting is the stock catback exhaust with upgraded turbos (Whoosh Stage X), fuel (Nostrum Stage 3), all supporting mods, and ZFG E85 race tune? Or would that be a waste of the upgraded turbos and fuel build.

Situation: My '22 ST is my daily driver. I purchased/installed a 3" AWE system connected to SPD catted downpipes, and the drone/noise is more than I expected/want. If the SPD catted downpipes + factory exhaust will support 99% of the turbo/fuel/e85 tune's potential, I'll return to stock catback and sell the AWE system while it's a few weeks old.

What I've found in research before posting / my effort to not waste your time: closest I've found are references to performance before/below upgraded turbos and fuel (plus all supporting mods). I've found no builds or references (explorerst.org or on the internet) for this build setup with stock exhaust.

Build List:
*aFE intake (replacing with FenFab prior to final tune)
*CVF intercooler piping
*Whipple IC
*SPD catted DP's
*AWE 3"
*Whoosh X's arriving shortly
*Nostrum Stage 3 (w/Goliath pump) in production
*ZFG tunes (91 Performance Current; E85 race once turbos/fuel is in)
*Suncoast Stage 3 rebuild once the stock 10R60 breaks
*All the suspension mods/bracing except FSB

Thank you,

DB

 

[SugarMouth]

Removing restriction in the exhaust is more important upstream as gasses are hotter therefore requiring more volume so a high flow DP with a factory cat back might be decent.

 

[DangerBrave]

Removing restriction in the exhaust is more important upstream as gasses are hotter therefore requiring more volume so a high flow DP with a factory cat back might be decent.

Thank you

 

[2020FordRaptor]

Hello,

Ask: How limiting is the stock catback exhaust with upgraded turbos (Whoosh Stage X), fuel (Nostrum Stage 3), all supporting mods, and ZFG E85 race tune? Or would that be a waste of the upgraded turbos and fuel build.

Situation: My '22 ST is my daily driver. I purchased/installed a 3" AWE system connected to SPD catted downpipes, and the drone/noise is more than I expected/want. If the SPD catted downpipes + factory exhaust will support 99% of the turbo/fuel/e85 tune's potential, I'll return to stock catback and sell the AWE system while it's a few weeks old.

What I've found in research before posting / my effort to not waste your time: closest I've found are references to performance before/below upgraded turbos and fuel (plus all supporting mods). I've found no builds or references (explorerst.org or on the internet) for this build setup with stock exhaust.

Build List:
*aFE intake (replacing with FenFab prior to final tune)
*CVF intercooler piping
*Whipple IC
*SPD catted DP's
*AWE 3"
*Whoosh X's arriving shortly
*Nostrum Stage 3 (w/Goliath pump) in production
*ZFG tunes (91 Performance Current; E85 race once turbos/fuel is in)
*Suncoast Stage 3 rebuild once the stock 10R60 breaks
*All the suspension mods/bracing except FSB

Thank you,

DB

You’d be the first one to try I guess with your mods. I wouldn’t see a humongous detriment to performance (I’m just speculating), but the stock exhaust has proved to flow well all the way to 600 awhp, and after that I’m assuming it’s relatively minor gains from there.