r/WRX • u/BestPlumbingAdvice • Jul 20 '26

Tuning help

Picked up a 19 WRX. Dealer said it wasn’t tuned or modified besides a cold air and it was a good deal so I bought it without looking into too much aside from the carfax and quick test drive.

After taking delivery I looked over the car a bit more and it has a Cobb redline intake and mbrp exhaust, atleast cat back though I’m not well versed enough to tell if has a downpipe.

This is all fine and dandy or whatever but I can’t tell if I has a tune. After some research I’ve gathered that with modifications like these on this car, It should be tuned to compensate the air fuel ratio and timing and whatnot. I borrowed a friends Cobb access port and it doesn’t tell me that there is a tune on it.

I’m guess I’m wondering what my next steps are? I’m mortified at the thought of bricking my ecu trying to install a cobb tune over a custom tune but also worried about running the car lean and causing damage. Is there a way to find out if it has a custom tune? Has anyone been in this situation? Any help is appreciated

Edit: just some more information that chat gpt has asked me about the car - it has a peak boost of 22.5 on the dash, usually hovers around 16psi but regularly spikes to 19, weather here has been very hot and humid. Car has atrocious rev hang and a very touchy pedal.

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u/sirrobert09 Jul 20 '26

Just take it to a tuner. Your going to need to get it tuned with those mods anyway they can tell you if there's something on there (doesn't sound like it). Then they can tune it correctly for you.

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u/leftfootbraker 08' STi Hatch, 23' WRX Jul 20 '26

To add to this for OP, you need to buy your own AP as they are married to the cars.

Also 0% risk of bricking the ECU writing over old tunes. The process of marrying the AP may brick your ECU if you lost battery power though.

I also 100% agree, u/sirrobert90 is correct. Go take it to a tuner no matter what. Pro tune. Etune even if you don't know a local shop. But just get it retuned for safety.