So who has the most highly modified CSL?

[Mike R]

Originally Posted by alexk

Some searching wouldn't be bad.

Here is the list of differences CSL list
The list was compiled mainly by Tom aka NZ_M3 and some other members.

The engine differences.
- Engine block (supposedly picked from the least flawed cast) – The blocks have the same part numbers as M3, Z4, but the full short block is a different part number 11007833675
- Engine head (exhaust valve and intake/exhaust cams - longer duration, same lift) – intake cam shaft 11317835041 exhaust cam shaft 11317835043 Exhaust Valve 11347833676 (30,5/5,95mm) – the valve springs are exactly the same
- Intake plenum (carbon airbox as we like to call it) Air Collector 11617833496 filter 13727838625 The other half of the carbon box: 11617833497 and control unit 11617833498 all the other ducting 11617833646; 11617833645; 11617833648; 13717896774 intake grill 51117895883
- Extractors/Headers (same as post 2005 M3s and Z4) 11627833500; 11627833643
- Cat converter (200 cell) 18307833673
- X pipe, resonators (thinner material - slightly lighter) 18107833503
- Rear muffler - slightly lighter 18107833504
- Different ECU - 25% more capacity 12147837328; 12147834982
- Pseudo Alpha N engine management (delete of MAF, but still runs a MAP sensor, and air temp sensor 13621739510- debate as to whether this is just for idle control however) MAP sensor part number 13627833561

Again, I don't understand why you believe that you will achieve 400bhp with cams, remap and full exhaust. Even with increased compression ratio.
This is daydreaming (the BMW Motorsport engine makes this figure).
Tuners obviously will tweak the dyno parameters to show big gains.
With cams, remap, full exhaust system, you are looking at 10ish bhp from stock.

I found that just after posting LOL .

I didn't say I believed that 400bhp was achievable with those things, I said that if 384bhp was achievable, then I thought that with further tuning (porting and a c/r increase), then MAYBE nearly 400bhp is possible. However, if you're suggesting that the 384bhp is pure fiction, then obviously that doesn't bode so well .

I don't do tweaking of figures, any work carried out would be transparent and on an engine dyno.

However, I've got to find a car first .