Quote:
Originally Posted by Bocho
What’s the difference between the MAD catback and Dinan? There are not a lot of video clips comparing stock vs catback exhaust sounds or one brand vs another.
I was initially considering a JB4 piggyback tune but after I discovered that I can’t remove the speed limiter or use the bolt-on mods fully, I figured BM3 would be the best. Do you have any experience with either tune?
Also, I was thinking of getting a backup/second ECU DME to clone my original OEM ECU DME. Then I would bench unlock the backup ECU and use that primarily. Then swap the ECUs whenever I need to get maintenance done at the dealership. I read that dealerships will flash the ECU which will lock it again during maintenance services and I don’t want to pay to get it bench unlocked every time I service my vehicle. Are my concerns valid? Is there a better way to do this?
Another reason I wanted to keep my ECU DME pristine is that I want to protect the resale value as I plan to work my way up to a X3M and then a X5M later on. I love the B58 engine for its reliability but jumping through all these hoops to get the DME unlocked seems like a lot of work compared to pre-2020 model years.
Thank you again!
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I was considering the dual ECU thing too till i was told that its basically pointless becuase your warranty wont get voided for tuning but for tampering instead. Basically if you were to do that and daily the tuned DME but only use the stock one for dealer visits that stock DME would show ridiculously low miles while the transmission and other computers would show the true mileage that you have driven. They will suspect something is up and will void the warranty for that reason.
RK tunes has this on their website that should help guide your build.
https://www.rktunes.com/blogs/build-...8-engine-gen-2 He's pretty spot on its generally agreed that on xdrive b58 platform 500whp can be achieved with just downpipe, intake, stage 2 and e30/40 blend.