The results are in! And they’re, well..

[digger]

I’m hoping to get more gains through the entire power band. Having a true 2.5” system from the headers up until the section 2 to 3 connection will allow for a much more efficient flow of gases.

Low end torque and top end power should definitely increase. Ideally the set up would be V1 stepped headers with oversized non catted section 1, 63.5mm dual resonated section 2, and meisterschaft titanium section 3.

cheers, looks like fuelling is ok.

based on other cars i'd expect torque to be like 250 through the midrnage which would be a fairly sizeable jump

[x Spades x]

You had a CSL intake with stock US headers? I feel like I never see anyone do that, but as someone who is more interested in an intake than any other mods (just because I care more about the experience/drama over power #s), I was always curious why it seemed like everyone who had a CSL intake had done headers first. Are there any downsides to CSL airbox + US headers, or is it just an illogical order to do if you are after "gains"?

I did the Evolve cf airbox, with stock headers (way back in the day). The sound is AMAZING, without the rasp of upgraded headers. It actually has a tone vs just loud intake. Take a listen!

https://youtu.be/ICw2qTt7qHU

[Tbonem3]

Still doesn't sound as good as when you got v1s and scorza

[Obioban]

Figured I’d give a quick update here.

Car has great compression, and have since replaced my fuel filter, converted my EKP to a traditional fuel pump relay, and had my injectors cleaned/rebuilt as needed.

Retuned by HTE, car is now putting down 318 whp and 231 wtq.

Definitely an improvement, and glad Hassan was able to make his magic happen.

Currently trying to find a way into a SS V1 set up, and will retune the car again with that new setup.

As for now, car is running like a dream, completely linear power band, and is a blast to drive. Thanks for all those who gave their input and experiences!

Please post an overlayed V1 vs ARH dyno, with optimized tune for each, once you have it! Same dyno, same car, optimized tune for each, would be a pretty nice data point to have.

[CrisSilberGrau]

IF youre fuel, and general health of the engine is comparable to mine, I'd expect you to see similar gains if not more. Good luck sir.

https://nam3forum.com/forums/forum/main-forum/e46-2001-2006/1925-s54-dyno-database?p=119770#post119770

[LSBNick]

Please post an overlayed V1 vs ARH dyno, with optimized tune for each, once you have it! Same dyno, same car, optimized tune for each, would be a pretty nice data point to have.

Definitely plan on doing a comparison. Depending on when I get my hands on some V1s. My goal is to just swap out the headers and section 1 and leave the stock section 2 to run the comparison. I have the 2.5 dual resonated section 2 on the way but that won’t be here until October.

overall gains are what I’m aiming for, but specifically more bottom end and mid-range. These ARH above 5.5k are amazing, and I can only imagine how a F/I setup would run with them. Def not ideal for a N/A design, but man is the sound incredible.

[LSBNick]

IF youre fuel, and general health of the engine is comparable to mine, I'd expect you to see similar gains if not more. Good luck sir.

https://nam3forum.com/forums/forum/m...770#post119770

I would’ve been ecstatic had I gotten your numbers!

[10figs]

Sorry for bumping this older thread, have a couple of questions for clarity as I am running into some issues with converting a DME to CSL spec.
1. For a USA MSS54HP DME is there any additional chips that need to be solder onto the DME?
2. Fuel pump issue, with CSL s/w the fuel pump does not work correctly, reloaded the original s/w and the fuel pump runs normal. Is “converted my EKP to a traditional fuel pump relay” the answer?
3. For emissions, plan to have a second DME to swap in with the original s/w
4. Mods - full SS exhaust system and carbon air-box without flap

TIA for any guidance on this!