This has been an idea of a couple guys. Not many people have ponied up for the cost of the GT30R as it is, let alone the extra 210 for the HKS .73 exhaust housing. It does sound like a good compromise between the .82 and the .63 housings from Garrett. The PTE .63 exhaust housing has proven to flow extremely well. The info on this housing can be found in searching for AMS's posts on his experience with the GT35R on their shops EVO. AMS is a really well known and one of the better DSM shops around. Check out the posts by searching AMS's profile for all posts made by member.