[NEIPA]

I have never tuned a car before. I Dinan tuned my 2020 X3 M40i at dealer a while ago. Nice improvement, smooth acceleration, although (as expected) HWY MPG dropped from 31 to 24.5. Any suggestion for additional mods to increase acceleration?

[X3M40pr]

I have the same MPG without a tune, maybe you're beating it more now tuned than before 😂. You can add a downpipe, air intake and charge pipe. If you're really into modding the hell out of it: meth injection, turbo upgrade, I believe there's a tune for the tranny.

[Chief Orman]

I am running an MHD stage 1 and an XHP stage 3 and I can get 28ish on highway; 14 around town with heavy foot

[dcchris311]

Get some light weight rims and tires to help with rotational mass.

[mailman_fin]

Originally Posted by X3M40pr

You can add a downpipe, air intake and charge pipe. If you're really into modding the hell out of it: meth injection, turbo upgrade, I believe there's a tune for the tranny.

Easiest, and most cost effective mods for getting more power/torque seems to be software, downpipe and fuel pump from Supra. Imo.

[mike@x-ph.com]

downpipe next for you. I recommend the active autowerke with GESI cats.

The other options will trigger the check engine light.

[mailman_fin]

Originally Posted by mike@x-ph.com

downpipe next for you. I recommend the active autowerke with GESI cats.

The other options will trigger the check engine light.

Just curious, why other options trigger engine light?

[mike@x-ph.com]

Originally Posted by mailman_fin

Just curious, why other options trigger engine light?

They don't use GESI or HJS cats. Those are the only 2 cats that do not trigger a check engine light.

[NEIPA]

Thanks for the replies.
Will look at downpipes/gas pump.
Wheels: many options; need to do some research.

[mike@x-ph.com]

Originally Posted by NEIPA

Thanks for the replies.
Will look at downpipes/gas pump.
Wheels: many options; need to do some research.

[Burr001]

Originally Posted by Chief Orman

I am running an MHD stage 1 and an XHP stage 3 and I can get 28ish on highway; 14 around town with heavy foot

I know Chief has one sitting next to him ATM unused AA downpipe, maybe if he doesn't install it, can sell it to you?

Here is his thread on it. https://x3.xbimmers.com/forums/showthread.php?t=1914841

I have AA downpipe and a JB4 installed atm and it has been great with the increase of power and performance. Next looking to get XHP flash for the transmission in the near future to improve it further.

[suby01]

Mods. A real tune mhd or bm3 are best options. Add that with a downpipe catted or not. And lastly you can run ethanol or race fuel. And all you need.