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Hello,

The dealership did a compression test that resulted 100 in all 4 cylinder for 2015 STI. It has 33k miles and the only mod is a downpipe stage 2 on cobb ap.

I do live in 6000+ altitude.
They are saying it's normal over there but it seems pretty low Still.

What do you guys think
 

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Probably OK. They are even - and with two counts against the normal 145 . . . they will be lower
 

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Higher altitude will give out lower compression numbers. Its a good sign that they are all even. I dont know if 100 is where it should be given your altitude but if the dealer said its fine then id probably roll with it. Where is it that you live thats 6000 altitude? Maybe someone from that same area can chime in with their compression results.
 

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I live at 6000ish feet too and when I compression tested i got numbers around 100-120, except for damn cyl 4 which was 60. 🙃 Don't know if this helps though cause that motor was dead.
 

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I wouldn't be concerned.

it would be highly suspect if all 4 cylinders had issues, that netted the EXACT same drop in compression.

If you aren't experiencing any issues, then I'd keep on sending it
 

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145psi * .8359 = 121.2psi

Take a cold lump into account and that could be another 20psi.

It's more indicative that all were exactly the same, which is good.
 
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