s52 EWS nonsense vs S50?

[brainfood]

Alright, looking at two swaps currently, a chipped s50 from a 95 M3,
or a stock s52 from a 98 M3.

The s50 is appealing because it's in better condition, and it's chipped, but the asking price is about 400 dollars more than the s52 However, I know that with the S52 and the OBD2 stuff, I need to have a ECU flashed to rid it of a few things, such as the EWS and secondary o2 sensors and such.

So, is there a way I can manually work around what would need to be flashed, or would I be spending the 400 or so for a tune/flash (like the TRM one) anyway, and I should just go with the S50?

I tried to do some research, but didn't find much, I appreciate the help guys!

[R1dd1ck913]

Well to me it sounds like a good idea to take the motor that is in the best shape. An s52 motor can always be swapped to OBD1

[justin_l_]

But if you swap it to OBD1 you would need a chip anyways. At that point you might as well keep it obd2 and just get it reflashed. As stated above, i would pick the motor that is in the best condition.

[nando]

just get the OBD2 flashed. it's not a big deal.

[Shftr8]

Check out kassel performance. I used them for my M52 swap and had everything removed from the ECU and it worked perfect and turn around was great to

[Poeman446]

I did a write up about flashing your own OBDII MS41.2 ECU. It's not very hard, and I think they have made a lot of advances in flashing since I did my swap a while ago. More flashing programs, full writes, etc. If you have to pay anyone, I recommend Dave from MMW. Not sure of the price, but it seems to be well worth it.

Edit: After further review, MS41.2 flashing has come a LONG way in a short amount of time. It actually inspired me to re-flash my car in the next week or so. If you need any help with it, I can try to be a resource. If you just want to send it off and be done with it though, I still think its well worth your money.