Top end mods for 2021 Downtown 350i

[k.jcksns]

I got a 2021 Downtown 350i here and looking to squeeze a bit more out of it, especially on the top end.
I've already swapped in a Malossi Multivar, and the acceleration is noticeably sharper, which is great.
I also put on a GPR exhaust, but honestly, I'm not feeling any real difference in speed.
I've seen some talk about a GPR Powerjet or similar fuel controllers.
Has anyone here had experience with one on the 350i for increasing top speed?
Or are there other effective mods I should be looking into to get that last bit of speed?
Any insights would be appreciated!

 

[kymcon4do]

Great choice with the Multivar, I heard that it definitely boosts acceleration. Just swapping in the GPR exhaust won't do much for top speed unless you also tweak the fueling. A Powerjet or a similar fuel controller could be beneficial, but you'll have to adjust the fuel mix to correspond with your mods.

The 350i has a top speed of around 80 mph in its stock form, so you're almost there. Tweaking the variator and springs can also make a difference. If you're looking for even more speed, getting an ECU reflash or adding a lambda controller might do the work

 

[B3loved]

A fuel controller or CDI mod can help your 350i reach higher RPMs and make better use of airflow