Here are some examples of what one of the good tunes on 335i can do

Enjoy

Hehe 
And he keeps up with Lambo untill 130mph

If he had aftermarket intercooler and better tune he might have been right there with him

BTW, Porsche had very good run (no misshift or anything), just slow 

Low end is where it really shines
It has small turbos, so when tuned most of the power is in low-mid range
It's a monster from 0-120
This is why it kept up with lambo until 130 and then it pulled away
You get nearly 3.5 - 3.7 sec 0-60 with this setup
It pretty much destroys anything on the road under 100mph

  photosvideos!

It's huge airfield in switzerland
These guys gather together once in a while and run each other
They record HD videos and take professional photos on these events
It's known event in BMW community and they have their own website

Anyways, if the run between two drivers werent "approved" between each driver, they re-run until all is perfect (no jump start, no mis-shifts, etc)
As you see, they eliminate traction issues as well, by doing it from 2nd-gear roll

335i is a turbo car and at that point (30mph) it's in full boost and have over 400lb of TQ when they hammer the gas
This car is just a monster anywhere between 0 and 120 mph
It'll take M5s, porsches, and bunch of other cars within these speeds
Some of them will catch 335i after 120mph, some will just hang on the tail
Tuned 335i's 0-60 is 3.5sec, btw

P.S. they both turn, but slightly different radius, since it's wide 2-lane entrance to runway

Now to get an airstrip..

Yeah...even a Mazda 3 can get more, 497 RWHP [edit: I meant Front wheel HP ] with 100 Octane and pistons. 

And 18psi?  Wow, that's a lot no?  Those are the only mods?  No pistons, etc?  I would worry about reliability issues.  No aftermarket cooling solutions?  How about the heating issues?  I can't forget the test against the G37...

I'm sure that  with 93 and like 12psi it's still going to be impressive nonetheless.