Turbo manifold design

[speedjunkie]

I'm looking at getting a new manifold made for a new turbo, and I was wondering what would be any benefits or drawbacks (or if it would even be possible) to mounting the turbo further back and down some, kind of like how the stock twins are, but obviously not RIGHT on the exhaust ports. I've heard long runners are better for response, but why? I would think the shortest, straightest runners possible would be better in that regard. I know putting it further back would put more heat by the ABS pump, so I'd probably put more shielding around that, and I also wonder if there would be any room for the downpipe to be mounted and angle down, but if it was lower it wouldn't have to angle as much anyway.

My main reason for asking is because I'm going to try out the new EFR 7670 and since the CHRA is longer than on a Garrett, it puts my compressor housing closer to my VMIC and then I'd have to use a smaller, more restrictive air filter and I don't want to do that. I also want to continue using an aluminum elbow off the compressor housing outlet, and in order for it to fit under the strut bar I'll have to move the turbo down a little probably. Right now I have an elbow welded onto my housing and I had them both cut a little shorter to fit under the strut bar, but I'd rather not cut down the new housing. I'm thinking of using a v-band to attach it, but then again I'd be modifying the housing, so I'm not sure on that yet either. I'd like to use an aluminum elbow either way though.

If I was home with my car and could just look and take measurements, or if I had ever made a manifold, I probably wouldn't even be asking about this haha. Just curious about this though. Any thoughts?