[OGMathias]

Hi everyone, so i'm currently seeking help on my 2007 BMW 328xi e90(Automatic & AWD) Im planning on installing a cold air intake and also a catless exhaust onto my vehicle. I'm wondering if I install both the intake and exhaust would need to be tuned. I'm worried about if it'll cause misfiring and then shortly will break down the engine and cause problems. so basically would it need to be tuned? Or if i install both the exhaust and intake my bmw would be completely fine?

Anything helps and thank you for reading my post

[colorado.e9x]

Intake you will be fine as long as theres a spot to put the MAF (all reputable intakes do)

Exhaust you'll need a tune if doing catless headers, if it's anything after that wont need a tune

[OGMathias]

Originally Posted by colorado.e9x

Intake you will be fine as long as theres a spot to put the MAF (all reputable intakes do)

Exhaust you'll need a tune if doing catless headers, if it's anything after that wont need a tune

so just out of curiosity, if i did install both the intake and exhaust and didn't tune it afterwards what would happen?

[colorado.e9x]

Originally Posted by OGMathias

so just out of curiosity, if i did install both the intake and exhaust and didn't tune it afterwards what would happen?

Assuming you're using stock headers the only difference would be sound. Power gains are negligible, nothing bad will happen if everything is installed correctly

[Vivek.]

Personally I've been running catless headers with no tune for the past several months. Took my tune off for a track day because it made more power than I needed and I haven't put it back on yet.

The majority of intakes aren't an improvement (performance-wise) over stock for what it's worth. May be able to save a little weight without any IAT increase with a good CF one but that's about it.

[neilvan]

Originally Posted by Vivek.

The majority of intakes aren't an improvement (performance-wise) over stock for what it's worth. May be able to save a little weight without any IAT increase with a good CF one but that's about it.

This^^ The euro box and others may have a better filter/more surface area so you get a little benefit from it but not much. The only intakes that will actually gain some are ones that change the air feed path (Dinan etc)

[OGMathias]

Originally Posted by colorado.e9x

Assuming you're using stock headers the only difference would be sound. Power gains are negligible, nothing bad will happen if everything is installed correctly

I do only have stock headers for now. i do know that when i get different headers tuning will be needed, but just was curious for now. Thank you for all your help!