Changing engine mods when custom tuned

[CIVICUK]

Hello, urgent question i need help on please.

I have had to swap back to stock downpipe and i was wondering is it safe to still run my custom tune? I had prl catted downpipe on when i was tuned.

Thanks,

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[Anger]

In general, its not a big deal. Trims will be off but in theory nothing serious. Since its a custom tune, I dont know how the car will behave but even with Ktuner basemaps, when you go from stock DP to aftermarket, the trims go slightly off but nothing serious.

If you have concerns, flash back to stock while running the stock DP. If you have ktuner, just check the basic parameters on tunerview to see how the engine is running (AFR and trims)