Well, sorry to be the one to report this but it looks like these tips are just a tad too small - here are some pics from my install attempt:
New tip on the left and stock HKS on the right
New tip inside the stock HKS
New tip held up to the HKS exhaust tube
Really bummed about this because I was seriously looking forward to having these on the car - oh well, sometimes things just aren't meant to be. I can say the build quality of these tips is top notch though!
On to the next project!