You are right. I meant midpipe!! I now have a 3" hks downpipe, stock midpipe and kakimoto 3" axle back. The exhaust shop modified my midpipe to match my downpipe. The kakimoto actually reduces to 2.5". I installed the kakimoto myself yesterday. I fixed my original post. Thanks for pointing it out.Your first post makes no sense. You say you have an HKS DP, then ask whether it's worthwhile leaving the stock DP? Huh?
So now you're running the HKS to the stock midpipe to the Kakimoto axle back? Do you have a reducer on there to tie the 3" HKS to the 2.5" midpipe?