Bumping this...
So I switched out a 3” with high flow cat for the beefy trackslag (catless) unit and couldn’t be happier! The fit is great especially considering it’s size, it sounds much deeper and aggressive with my XR1 mufflers - and it really helped my hybrid spool up and hit the set point much much sooner. I’m sure some of that can be contributed to being catless...
These shots from the logs for comparison also have very close ambient and IATs... zero tune adjustments and same fueling at e48ish also in the upper RPM range the wastegate duty’s down about 8-10% across the board. Having that extra spool also makes the car feel (and tires cry) much quicker.
Btw Old dp the boost was at 18-20psi when at 3600
Top 2 are the old DP bottom is from 2 nights ago.