[Desertnate]

Originally Posted by i128

Are there existing tools for regular consumers shopping in the used to find out if a car's ECU has been previously tuned/flashed?

I personally buy all my cars, & have never tuned the DME, but if I was to lease something like an F30 or a G20, my first (and maybe only) mod would be an ECU performance flash!

In the BMW world I don't know. With VW and Audi's, it's rumored the dealership can tell if the ECU's been flashed when they hook it up to their diagnostic computers. There is a checksum bit that is advanced every time the ECU is flashed. If the number doesn't match what VW/Audi thinks it should be, it gets flagged.

My comments should have said "mods" rather than tuned. Some cars I looked at the seller freely mentioned an ECU tune, while many others had suspension mods etc or an exhaust.

Originally Posted by j2dad5389

Y'all are telling me if you're getting a 335 or 435; you wouldn't want yours to come with an aftermarket charge pipe? The stock ones suck and are known to blow. If I'm buying a used car and see one that has one that's a win for me. Bonus if it's an upgraded intercooler too.

Every N55 I've owned I instantly change out the charge pipe for aluminum. It's more of preventative than performance if anything.

I might be OK with an aftermarket charge pipe, but not an intercooler. My biggest concern with any of those types of mods is the quality of the part and the quality of the installer. Any used car is a crap-shoot since you don't know what's been wrenched on in the past, but obvious things like a charge pipe or major component like an intercooler would make me nervous. If everything is OEM and looks to be original, there is far less to question.

[Psi5]

Originally Posted by j2dad5389

Y'all are telling me if you're getting a 335 or 435; you wouldn't want yours to come with an aftermarket charge pipe? The stock ones suck and are known to blow. If I'm buying a used car and see one that has one that's a win for me. Bonus if it's an upgraded intercooler too.

Every N55 I've owned I instantly change out the charge pipe for aluminum. It's more of preventative than performance if anything.

Roger that. No way I am buying a modded car. If the OP, or anyone else, wants to swap whatever they want, go for it. Just do it b/c you want it, not b/c anyone else is going to pay anything more (or less) for it when you sell.

[j2dad5389]

Originally Posted by Psi5

Roger that. No way I am buying a modded car. If the OP, or anyone else, wants to swap whatever they want, go for it. Just do it b/c you want it, not b/c anyone else is going to pay anything more (or less) for it when you sell.

You must've never blown a charge pipe Lucky. I've blown both my twice on stock. Makes you question why BMW went with the flimsy plastic design. Either way, this is really the only mod I'd be happy to see on my car.

Anything else, I agree with you.

[johnung]

Originally Posted by 340i9114s

Hey, actually dont plan on selling for like 5 years. Just got the car 6 months ago, and wanted to be real careful before I do any performance mods on the car (if any at all)

If you intend to keep the car for five years then don't bother worrying about how each mod might affect resale. After five more years of depreciation and mileage no normal mods that you do to the car will have any real impact on what you can sell the car for in 2025.

Just mod the car anyway that you like and enjoy driving it for the next five years.

[Gen13 F36]

No matter what you do... a Honda or a Toyota with the same year vintage as your car will sell for more😂

[Psi5]

Originally Posted by j2dad5389

You must've never blown a charge pipe Lucky. I've blown both my twice on stock. Makes you question why BMW went with the flimsy plastic design. Either way, this is really the only mod I'd be happy to see on my car.

Anything else, I agree with you.

Fortunately, I have not. My E90 made it 150k+ and my current F32 only has 4500 miles on it. It it failed by now, I'd be really mad.