Thinking about switching over M5 to 21 E63
MBWorld Fanatic!
Joined: Mar 2011
Posts: 2,496
Likes: 1,574
From: Canada
2023 E63S Wagon
If modding stock to stock it comes down to
BMW has the fuel and turbos to go nuts but not the bottom end. The temptation to surpass is great.
Mercedes has the bottom end but runs out of turbos and fuel.
Either car past stage 1-2 costs $ to address it's respective "shortcomings".
If I won the lotto ECC multi-tune w/Pure 900 turbos, spool fx200 hpfp and dual lpfp. Pump 93 tune will make 820-830whp. Map switching on the fly w/ethanol or race gas 900+ whp with the flick of a button. Transmission rebuilds not included.
BMW has the fuel and turbos to go nuts but not the bottom end. The temptation to surpass is great.
Mercedes has the bottom end but runs out of turbos and fuel.
Either car past stage 1-2 costs $ to address it's respective "shortcomings".
If I won the lotto ECC multi-tune w/Pure 900 turbos, spool fx200 hpfp and dual lpfp. Pump 93 tune will make 820-830whp. Map switching on the fly w/ethanol or race gas 900+ whp with the flick of a button. Transmission rebuilds not included.
MBWorld Fanatic!
Joined: Jul 2013
Posts: 2,591
Likes: 809
From: Toronto, Ont, Canda
go fast grocery getter wagon
If modding stock to stock it comes down to
BMW has the fuel and turbos to go nuts but not the bottom end. The temptation to surpass is great.
Mercedes has the bottom end but runs out of turbos and fuel.
Either car past stage 1-2 costs $ to address it's respective "shortcomings".
If I won the lotto ECC multi-tune w/Pure 900 turbos, spool fx200 hpfp and dual lpfp. Pump 93 tune will make 820-830whp. Map switching on the fly w/ethanol or race gas 900+ whp with the flick of a button. Transmission rebuilds not included.
BMW has the fuel and turbos to go nuts but not the bottom end. The temptation to surpass is great.
Mercedes has the bottom end but runs out of turbos and fuel.
Either car past stage 1-2 costs $ to address it's respective "shortcomings".
If I won the lotto ECC multi-tune w/Pure 900 turbos, spool fx200 hpfp and dual lpfp. Pump 93 tune will make 820-830whp. Map switching on the fly w/ethanol or race gas 900+ whp with the flick of a button. Transmission rebuilds not included.
Thread Starter
Senior Member
Joined: Jan 2016
Posts: 337
Likes: 82
'15 E63S,'21 LCI M5
Just figured I would update. The 21" I was initially interested in sold to a wholesaler, really haven't been actively continuing a search. My salesman has alerted me a 2020 213 has just been traded in with 3X K miles.
I will take this one on an elongated road test and see how it goes.. My F90 has now crossed the 80k mi marker so this would be a nice upgrade in that department. So far knock on wood it's been ok.
Hoping the 2020's were less common with rms, but looks like it still happened to some. Something i'll check for sure. I see fidelity will no longer cover the 18/19's oof.
I will take this one on an elongated road test and see how it goes.. My F90 has now crossed the 80k mi marker so this would be a nice upgrade in that department. So far knock on wood it's been ok.
Hoping the 2020's were less common with rms, but looks like it still happened to some. Something i'll check for sure. I see fidelity will no longer cover the 18/19's oof.
Last edited by SilverE5588; Aug 11, 2025 at 11:01 AM.
Out Of Control!!
Joined: Jun 2004
Posts: 13,799
Likes: 3,228
2014 E63S; AMS 100 octane ECU dyno tune; EDOK TCU tune; BB intakes; sprintbooster
Just figured I would update. The 21" I was initially interested in sold to a wholesaler, really haven't been actively continuing a search. My salesman has alerted me a 2020 213 has just been traded in with 3X K miles.
I will take this one on an elongated road test and see how it goes.. My F90 has now crossed the 80k mi marker so this would be a nice upgrade in that department. So far knock on wood it's been ok.
Hoping the 2020's were less common with rms, but looks like it still happened to some. Something i'll check for sure. I see fidelity will no longer cover the 18/19's oof.
I will take this one on an elongated road test and see how it goes.. My F90 has now crossed the 80k mi marker so this would be a nice upgrade in that department. So far knock on wood it's been ok.
Hoping the 2020's were less common with rms, but looks like it still happened to some. Something i'll check for sure. I see fidelity will no longer cover the 18/19's oof.
Last edited by PeterUbers; Aug 11, 2025 at 12:09 PM.
Senior Member
Joined: Sep 2023
Posts: 303
Likes: 183
2023 E63S AMG - Grey Magno
I just extended the warranty on my 21 E63. I was in the same boat, warranty expiring, and I was shopping. I really wanted a G63, been on my list forever, but the tech is ancient (2019-2024). It's insane to me that they kept making the G63 with COMMAND and not MBUX even though MBUX has been out since before the FL G63. Anyway, in every car tuber video, they consistently admit the M5 is faster, but it's the E63 they'd take home. It's an unbelievable car and you will have a smile ear to ear.
On the suspension, I researched and everyone unanimously said the pre FL (2018-2020) was stiff as hell. I never thought that would bother me, I mostly just cared about the updated grille. That said, I drove my buds 2019 garage queen, had maybe 8500 miles, and they were not lying. The thing is stiff as a corpse. You feel everything, and not in a good way in the steering wheel, you feel it in your bones. Maybe in my younger days I wouldn't mind the extra rigidity, and yes 100% the exhaust sounds better/louder, but the stiff suspension would have been depressing for me. If you plan to DD, get the 21, it still looks like a million $ and its super comfortable when you need it to be.
On the suspension, I researched and everyone unanimously said the pre FL (2018-2020) was stiff as hell. I never thought that would bother me, I mostly just cared about the updated grille. That said, I drove my buds 2019 garage queen, had maybe 8500 miles, and they were not lying. The thing is stiff as a corpse. You feel everything, and not in a good way in the steering wheel, you feel it in your bones. Maybe in my younger days I wouldn't mind the extra rigidity, and yes 100% the exhaust sounds better/louder, but the stiff suspension would have been depressing for me. If you plan to DD, get the 21, it still looks like a million $ and its super comfortable when you need it to be.
