[prjninety]

Hello,
I was looking for performance mods for my new to me 2008 325i N52B25N. I read about the 3 stage intake mod for 325i. And was confused about the result of mod on the 2.5 engine vs 3.0 engine.

My car comes with intake: https://www.realoem.com/bmw/enUS/sho...diagId=11_3756
This looks like it has already got the 3 stage intake but with a different manifold (part no. 11617559525 vs 11617559523 in 330i) which I read might be with smaller ports for 2.5 engine compare to 3.0 engine.

I read here [https://bmwtuning.co/n52-intake-mani...pgrade-guide/] that 330i intake gives good gains in N52B25. But also in some places that the gains may not be so much. I'm confused here.

I was wondering - if I tune the car with the stock 3 stage intake, am I going to see any gains?
And if I put the 330i 3 stage intake on my N52B25 what gains I could expect?

Thanks!

[e90n52b25]

I installed the n52b30 3 stage intake manifold into my german 2005 n52b25 (which also had already a 3 stage, but slightly different).
I feel more torque in mid rpm (2000-4500), it is better, but you won't have a new car.
But, I tried the conversion tune from the US 325i (3.0L I guess) and it worked (some vanos and DMTL error codes, US n52 not fully compatible with EU I guess) - I had incredible performance gains up to 5000 rpm, so I guess there is only a good 325i tune left for some gains

[chris55552]

Originally Posted by prjninety

Hello,
I was looking for performance mods for my new to me 2008 325i N52B25N. I read about the 3 stage intake mod for 325i. And was confused about the result of mod on the 2.5 engine vs 3.0 engine.

My car comes with intake: https://www.realoem.com/bmw/enUS/sho...diagId=11_3756
This looks like it has already got the 3 stage intake but with a different manifold (part no. 11617559525 vs 11617559523 in 330i) which I read might be with smaller ports for 2.5 engine compare to 3.0 engine.

I read here [https://bmwtuning.co/n52-intake-mani...pgrade-guide/] that 330i intake gives good gains in N52B25. But also in some places that the gains may not be so much. I'm confused here.

I was wondering - if I tune the car with the stock 3 stage intake, am I going to see any gains?
And if I put the 330i 3 stage intake on my N52B25 what gains I could expect?

Thanks!

I just did this, I mean yesterday. The processs was easy to follow, I got one from a good seller who included the disa valves so thats a plus. Now my understanding is the 325i guys will get bumped from 215hp all the way up to 255hp, me coming from the 328i, I jumped a good 25 to 30 but honestly to me it felt like a huge bump in performance. Keep in mind im not a race guru with the need for speed and dont need to be going mach 1 with flames shooting out of my ass to be happy lol. I just ease around and enjoy the smoothness of the N52, besides that there are way too many cops where I live and half of which have no businesss with a badge. I was impressed with it as well as my brother who knows how my car drove before and after the mod. It was money well spent, time well spent installing it, and just overall very pleased with the outcome. Its totally worth it. I was genuinely suprised at how much umph I gained at low rpms all the way up, it feels like its a real linear boost in performance. The engine sounds a little better too. Just my 2 cents