[Jerry300zx]

I recently bought a 2019 m5 competition. It has 24k on it and was returned to the dealer it was purchased at. They had the car in the show room. As I was looking the car over, a salesman told me he sold the car new to the first owner. He said the car was tuned and had over 700hp. He told me it was covered under warranty.

After purchasing the car, I inspected the engine bay for a tune box but could not find any.

Then I read on Dinans website, you can ship them the computer and they will flash the software onto it?

Does anyone know how I could find out if it is tuned other than bringing it to the track?

I'm thinking the sales guy was just telling me that to sell the car.

[onfireX5]

Buy a cheap OBD2 scanner and scan the car at wide open throttle safely and see what the boost psi is.

[pbonsalb]

A high level scan tool may pull codes for suspected tuning. Did the dealer say whether the tune was warrantied by BMW or by the tuner? Dinan, Carbahn, APR, and others offer warranties that match the factory warranty. BMW does not, for any problem attributable to the tune, though a few dealers may look the other way and cover the claim unless BMW corporate investigates because it is a big claim such as for a new engine.

[Maverik259]

Originally Posted by Jerry300zx

I recently bought a 2019 m5 competition. It has 24k on it and was returned to the dealer it was purchased at. They had the car in the show room. As I was looking the car over, a salesman told me he sold the car new to the first owner. He said the car was tuned and had over 700hp. He told me it was covered under warranty.

After purchasing the car, I inspected the engine bay for a tune box but could not find any.

Then I read on Dinans website, you can ship them the computer and they will flash the software onto it?

Does anyone know how I could find out if it is tuned other than bringing it to the track?

I'm thinking the sales guy was just telling me that to sell the car.

Sounds like the SA knew the buyer/seller and they probably talked about it. If it has a tune and BMW knows then it is NOT CPO. So that could be your first clue.

You could also simply take it to the dealer service and ask them to check. But then you're opening yourself up to engine warranty issues. But then theres always the hand to play regarding the SA telling you about it as a selling feature and exclaiming it was covered by warranty.

[Boosted_8]

Originally Posted by onfireX5

Buy a cheap OBD2 scanner and scan the car at wide open throttle safely and see what the boost psi is.

This

Will take one squirt with a Bluetooth dongle plugged to see peak psi.

[RS61]

What's the peak psi for a 700ish bhp tuned f90 on pump gas? Been trying to find psi boost numbers and can't seem to track them down anywhere, especially stock ones for standard f90, comp, and CS.

[Bure@]

It’s not 💯 but you can check your sport display, if it’s more than this then most probably it’s tuned

[23109VC]

They cannot CPO a car that was tuned… AFAIK

[Charmonafarm]

Hi guys,

Just picked up my M5C from main dealer bmw. They didn’t tell me but I’ve looked under the car and noticed the rear exhaust system has been fitted with a Miltek exhaust system. BMW have not replied with what they are going to do yet. But I suspect put the standard system back on. My question is - would you say it’s likely that the car has had a tune? It’s just there isn’t any warning lights on so I’m a little confused if someone has messed with it.

Cheers !

[ResIpsaLoquitur]

Originally Posted by Charmonafarm

Hi guys,

Just picked up my M5C from main dealer bmw. They didn’t tell me but I’ve looked under the car and noticed the rear exhaust system has been fitted with a Miltek exhaust system. BMW have not replied with what they are going to do yet. But I suspect put the standard system back on. My question is - would you say it’s likely that the car has had a tune? It’s just there isn’t any warning lights on so I’m a little confused if someone has messed with it.

Cheers !

This is a very difficult, perhaps nearly impossible, question to answer just by looking at the car, or off the basis that you don’t have a CEL. Plenty of flash tunes exist where the car is not constantly throwing a CEL on the pre-LCI. As for LCIs, there are some tuners claiming they are able to tune after unlocking DMEs, though if it’s true, it’s nowhere near as common as pre-LCI cars which have had the ability to unlock DMEs for a while now. Your best bet is to run tune detection on the car if you want to know for sure.

Some people will add an exhaust and also add a tune. Others may just install an exhaust. Again, tough to use as an indicative factor.

[Charmonafarm]

Originally Posted by ResIpsaLoquitur

This is a very difficult, perhaps nearly impossible, question to answer just by looking at the car, or off the basis that you don’t have a CEL. Plenty of flash tunes exist where the car is not constantly throwing a CEL on the pre-LCI. As for LCIs, there are some tuners claiming they are able to tune after unlocking DMEs, though if it’s true, it’s nowhere near as common as pre-LCI cars which have had the ability to unlock DMEs for a while now. Your best bet is to run tune detection on the car if you want to know for sure.

Some people will add an exhaust and also add a tune. Others may just install an exhaust. Again, tough to use as an indicative factor.

Hey bud thank you for your reply. It’s a LCI model. It doesn’t feel any quicker than the demo I had for a week so tbf im hopeful not. The system sounds rubbish. No pops or bangs and hardly louder. It’s a £4k system and I don’t know why you’d bother personally for little change.

[ResIpsaLoquitur]

Originally Posted by Charmonafarm

Hey bud thank you for your reply. It’s a LCI model. It doesn’t feel any quicker than the demo I had for a week so tbf im hopeful not. The system sounds rubbish. No pops or bangs and hardly louder. It’s a £4k system and I don’t know why you’d bother personally for little change.

You’re welcome! As it’s a UK LCI, it has OPF which mutes out a lot of the sound. OPF removal is a thing, but it will typically throw a CEL, likely cause the car to fail inspection, and is certainly deemed a warranty voiding modification by BMW. The previous owner likely wanted some more sound without removing the OPF due to the ramifications of doing so, and thought that the exhaust might do the trick.

I feel for anyone that has acquired an M5 in a market that requires OPF, as it signifcantly neuters the sound.

[Jazz_V]

I tried to find out if my car had an after market tune after I purchased it as my BMW dealer said it had been tuned but they did not show me how they knew it was tuned when I took it in for a noise issue from the engine. I called Dinan and Carbahn. They just need your VIN number to check their database.