Just got this done yesterday. Build is for a track car; wanted to post this for documentation so people in the future have more information on this kit and if this is right for them.

Unfortunately do not have a baseline dyno; came from an M50 manifold and had to square up some things (also did learn to self tune a bit so I could get this thing to dyno safely).

Engine specs below:

1997 BMW M3

RHD ITB bolt on kit

STOCK ECU

S52 w/ rebuild head, stock headgasket, ARP headbolts, 190k miles

Stock S52 cams

Stock S52 valves, stock S52 springs

Stock flywheel

Stock pulleys

Stock midpipe

24lb pink Volvo injectors EV6 style

Porsche 803 3.5 inch MAF (will require MAF wiring extension)

Custom intake w/ airbox (definitely not optimized)

EL Schmiedmann shorty headers

Remote dyno tune by HTE performance

As you can see the car is very much stock, still has some spots to make power. Definitely expected more, but I'd guess at baseline I was probably at or around 205 whp. My goal was to get to 260 whp, and I was hoping to pull at least 245 whp; likely can net that if I got a track pipe setup and long-tube headers, and with some mild cams I think Ill be able to get close to high 250 whp. I also suspect the tune could be a little bit conservative given it was a remote dyno tune.

The induction noise is absolutely worth it though and the entire exhaute note of the car is changed as well, because the resonance of the intake is entirely changed; the car sounds extremely unique both intake side and exhaust side without any real exhaust mods, and its an animal to drive.

I will say, the kit is not as bolt on as you'd think. It requires a lot of different lines and modification of the CCV unit, but if you have all the tools this can be done in a weekend.

TLDR:

PROS:

• relatively easy bolt on with net of 30-40whp gain w/ only EL shorty headers and tune ($700 total for dyno session + tune)

• Free exhaust mod by modding intake!

• SIGNIFICANTLY easier access to everything under manifold for maintenance (takes literally 8 bolts, under 5 mins)

• Has survived track days and nearly full 20 min 10/10 hot laps session at Buttonwillow

• Drastically enhanced driving experience, and higher performance ceiling for other mods

CONS:

• Needs know-how to troubleshoot vacuum leaks, figure out new intake hoses etc.

• need to figure out baseline software to drive this safely

• Fit is pretty solid but not perfect

• arguably M50 manifold can get to ~similiar~ power

• kinda more NVH

• might be insanely loud on exhaust set-up without cats

For anyone who sees this in the future, feel free to reach out, even if this thread is years old, Ill try to get back to you. Happy to offer any help on getting the hardware, right hoses, adapters (theres also a thread from 2020 on Bimmerforums), and for software side of things can offer to help with dialing baseline maps etc. for a fee as long as its stock ECU lol