Well i picked up a test pipe from billet design today and slipped it in when I got home. The install took about 20 minutes, I have not installed the mil eliminators yet. The pipe is quite a bit lighter than the cat and it made a good difference in the top end pull of the car. The cel has not appeared yet. It may have made more of a difference on my car since the stock 2.5 cat was sitting between my 2.7 d/p and 3 catback. Some might not like this setup for a daily driver, it's pretty loud, especially at WOT