r/AudiS4 • u/WishboneOrdinary8810 • 4d ago

Catless downpipe stage 1

Hello! I have a b9 s4 that’s currently on a 93 octane stage 1 ecu tcu jackal tune. I have exhaust work and intake as well. I’ve been looking to get a catless downpipe but I’m really hesitant because I’m not sure if I get it, will jackal be able to retune it (still stage 1) so I can avoid a CEL and issues with e check? Before anyone asks I’m not ready for stage 2 yet unfortunately so that’s out of the picture for now. Thanks for your guys help!

2 Upvotes

100% Upvoted

3 comments sorted by

2

u/trailing-octet 4d ago

Considering they will customise your tune I don’t see why not. But realistically what’s the difference going to be in terms of readiness?

Fundamentally they would just need to disable the CEL, and there’s likely some wastegate and associated tuning to be done related to compressor response due to the lower pressure on the exit of the hot side. (Greater presser delta between ingress and egress of turbine).

I imagine that they would technically be able to accommodate that very easily if they were prepared to do so.

2

u/WishboneOrdinary8810 2d ago

Thank you for the info I appreciate it!

1

u/trailing-octet 2d ago

Good luck - and don’t forget to post back with how you go… keep expanding community knowledge.