27WON Performance Downpipe for 2022+ Civic 1.5T/2023+ Integra 1.5T [FE1/FL1/DE4]

Car sounds great and turbo spools faster (earlier) ktuner is a must though, with the CEL on the 25 Si at least it will also Reduce power by putting car in limp mode and take away rev matching but you can get rid of the cel by going into ktuner which will give you rev matching back and take the car out of limp mode.

Let that turbo breathe

For downpipes 27Won's offering is a great choice in quality and performance. The install wasn't bad, being careful with the removal of the turbo studs, it went on smoothly, and it bolted right up to my 27Won front pipe with no struggle. Performance-wise, you can instantly tell that the turbo spools faster and makes extra power throughout the rpm range. I had it paired with the TSP tune, and the car felt amazing to drive. I would definitely recommend a downpipe for the 1.5T and specifically the 27Won Downpipe.

Sounds good. But you will need a tune.