I'm thinking I want to try a Renntech, OE, or Eurocharged tune in my newly required '09 E63. I may be wasting my time but want to know everyone's opinion. thanks in advance!

 

Don’t do either. Barry from Eightysixtuned is all you need. If you truly want the best he’s your guy.

 

I currently have a shelf EC 93 Tune on my car - I've had them dyno tune my prior E55 and had their tune on my W204 C63 as well.

Thousands and thousands of miles on all their tunes; and I don't drive like a granny often. Others you listed are reputable, but I've always used EC with great success - I'm a fan of Jerry's work.

Best of luck..

 

Depends on whether you're looking for something simple to "plug 'n play" or if you're willing to put in the work with detailed feedback and multiple logs / revisions to really dial things in.

If the former, hard to beat RENNtech. For the latter, however, I couldn't be happier with the quality of tuning and customer service from Barry / eightysixtuned.

 

How is everything going?

 

I haven't moved forward with a tune yet but most likely will go with Renntech. The price difference between the tunes is negligible. All of them are in the $1200-1800 range.

 

Kleemann is a great option too, they have had very positive feedback by forum members. Cory is a great guy, excellent support.

 

MANY E55 owners are thoroughly satisfied with V-Tech tunes myself included. They also offer tunes for the E63, for around $900: https://vtech.ge/en/products-en/6-me...1-e63-amg.html

Barry would also be a good option.

 

Can vouch for Barry from eightysixtuned