.91 divided or .88 open turbo housing

I was running a T3 turbo housing on a T3 manifold on my 66mm turbo.

I was hitting full spool at 3500rpm. Although it is fun on the low end, I feel like the car pulls weak after 5800rpm. Plus hard to get decent power out of a tiny T3.

So I'm looking at a .91 divided turbo housing on a divided manifold, will this be better compared to a .88 open end turbo on open end mani?

Any estimates when I should be hitting full boost?

I'm running stock cams, those will be one of the next upgrades once the car is complete and running well.

Looking to around 600bhp out of the car, should keep me happy.

I'm also considering the .88 A/R and a cast manifold

bigger is better

Is this a BW S366?

For 600hp get the .88 and an open cast manifold.

Few good and cheap options: the SPA or the Threadstone (just port it a bit).

For cams I would suggest USDM or HKS 264 cams.

If you mean 600 WHEEL hp, I would take the .91 and SPA manifold + some GSC S1 cams.

There is absolutely no need for a tubular manifold for those powerlevels.

EDIT: If you mean 600hp at the flywheel, get something smaller than a 66mm. A BW 83-75 or 88-75 with a cast manifold and piggyback will get you there very easy.

Hey yes understood, I will get a 60mm or 61-62mm turbo soon. I would like to just stick with what I have now, since I just bought the turbo not too long ago.

I am going after 550 wheep HP, so whatever that is in bhp, around 650bhp ?

but I will do whatever the stock cams allow me, I will definitely be getting HKS 264's eventually