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      11-09-2012, 12:03 AM   #14

Drives: '08 E90 335i
Join Date: Jan 2012
Location: Northern NJ

iTrader: (3)

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2008 BMW 335i  [3.75]
Originally Posted by tphss View Post
How do I know which ROM do I have (what does that even mean)? Is that the part that cannot be altered in the software?

If I have a ROM that needs COBB to modify it, is that a complicated process? I want the least amount of headache, and don't want to be with tech support just to get something working or risk causing my car to run un-smoothly.
That's why the JB+ seemed nice to me, but I am still leaning towards the COBB.
When you got to initially install & marry the COBB AP to your car, it'll tell you what ROM you have (IJE0S, I8A0S, IJE0S, IKC0S). They basically dictate which specific OTS Maps you download from COBB's website (

I use IJE0S & have never had an issues with Boost Oscillations (even when using the Beta Maps). Boost Oscillations can easily be overcome by using an Older Version of the Same Map or getting COBB to email you a revision (just like get a custom E-Tune). You also have to remember the only time I've ever heard of problems, it wasn't on the approved/officially released maps.

I can promise you that the JB+ is a waste of money & will force you to make additional investments in the future if you continue to mod (JB+ basically adds a max of 5 psi, which only makes sense having on a stock car). I can promise out of all the majors, COBB & JB4 have the best customer service so don't worry about getting abandoned by the tuner.

IMO COBB is the least headache causing tune. Not only are their tunes bulletproof, but it's the easiest to Data Log & read Fault Codes with because of the AccessPORT. If you have any additional questions, you're welcome to PM me.