The trickflow. H/c package will only get over 500hp at the flywheel, and I guarantee thst was with some dyno magic too.. You're really looking at 420-440 at the wheels. Not that big of a deal now days. The cam they have is a bit on the small side too. There are better set up that you can do for less. 100k isn't much. My LS still had the hash marks in the cyls at 90k miles from where it was honed by GM.
So what intake are you running with a 90mm TB? No headers? You should look into getting a real tune instead of one from a hand held too. Is this an A4 or M6? Are you ready to spend $ upgrading the rear, trans, suspension and to buy good soft tires? More power will lead to breakage and traction issues otherwise. Ever thought about upgrading the brakes so they can handle stopping the car better from higher speeds?
So what intake are you running with a 90mm TB? No headers? You should look into getting a real tune instead of one from a hand held too. Is this an A4 or M6? Are you ready to spend $ upgrading the rear, trans, suspension and to buy good soft tires? More power will lead to breakage and traction issues otherwise. Ever thought about upgrading the brakes so they can handle stopping the car better from higher speeds?