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BerDz3nA
04-14-2018, 06:32 AM
What are the ZHP Performance mods that have been proven to increase HP ?

And in which is money worth spending hp-wise ?

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Vas
04-14-2018, 07:02 AM
Headers and tune. Everything else is just for sound.

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cornercarver
04-14-2018, 07:15 AM
Try browsing the Performance threads. Quite a bit of info here...
BMWCurves
04-14-2018, 07:41 AM
And while they're not horsepower related, lighter wheels with grippier tires is a high value upgrade to handling performance.
ELCID86
04-14-2018, 10:41 AM
LSD to keep all that power on the asphalt.
Newjack
04-14-2018, 10:48 AM
Headers and tune. Everything else is just for sound.

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This is the best answer to the question OP.

But as the others above me have stated, adding lightweight wheels and grippy summer tires with an LSD will make a huge improvement in how the car handles and feels without actually adding any power.

From the factory there really isn't much you can do to improve power. BMW did a really great job with the M54 motor.
Reasoned1
04-14-2018, 03:22 PM
While it doesn't technically add horsepower, a shorter differential gear ratio (3.38 is most recommended) increases torque at the wheels and is probably the most impactful performance mod you can do short of FI. Furthermore, a used, open diff is cheap ($200) and pretty easy to install. Make sure you change both diffs if it's AWD.
Newjack
04-14-2018, 05:22 PM
While it doesn't technically add horsepower, a shorter differential gear ratio (3.38 is most recommended) increases torque at the wheels and is probably the most impactful performance mod you can do short of FI. Furthermore, a used, open diff is cheap ($200) and pretty easy to install. Make sure you change both diffs if it's AWD.I'm pretty sure the diff in autos is different (shorter) than the diffs in manual trans. I don't remember the ratio difference off the top of my head.

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ZHPizza
04-14-2018, 05:50 PM
I'm pretty sure the diff in autos is different (shorter) than the diffs in manual trans. I don't remember the ratio difference off the top of my head.

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http://www.bokchoys.com/differential/GearRatios_E46.htm