Lovefab used to produce the GT1 sidewinder, but it has been discontinued. There are a few top mount tubular manifolds currently available.
Is your GT35 ball bearing? A 35R should be spooled ~4700-5200RPM on a good manifold. At those boost levels you may be better off with a GT30 sized turbo, but if a GT35 is what you already have, it will also work very well.
Here's what mine looks like.
Feel free to shoot me some questions.