I have a 2004 audi s4. i want to give it a ecu upgrade. the only brand i have seen is APR and theres looks pretty decent...but i want to look at others before i buy it....anyone have any suggestions???

 

GIAC. I'm not sure how good it is for the 4.2L V8 but I have it for my S4 and it's great.

http://www.giacusa.com/products.php

 

i've got a tune by speedtuningUSA.com

cheap.... and can definetly feel the gains

 

i say giac thats what i have and its the most agressive

 

yeah, if you are looking for b5 number out of your for the chip not going to happen, but still getting 25-30 hp and higher rev limit and not speed limit is nice. Just do some searching on here and you will find lots of threads about this.

 

Vast race file ftw. www.vastpeformance.com