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Thanks @waxracing Turns out G30-770 T4 twin scroll 1.06a/r isn't available for reverse rotation. So really, the only real question is, will the G30-770 v-band .83a/r produce 500whp on pump gas? If it's unlikely, should I go to G30-770 1.01a/r, G30-900 .83a/r or G35-900 .83a/r? Or any other combination...

What a/r and rear housing/flange?

Would you expect to see 500whp from the g30-770 1.06a/r twin scroll T4? I feel like it's to big for a primarily street application?

Hi Lithium, I have heard a couple people say, Garrett say with the smaller G-series twin scroll is not require and I have assumed this is the case, based on the lack of twin scroll availability. Garrett only do a T4 twin scroll 1.06a/r, which I feel is too big for an RB25 for my use case? Yes, I was certainly thinking the G30-770 but was concerned about the lack of twin scroll. The 500whp isn't the critical part, it's a 'build for this power' and hopefully get there. More important are drivability and response. Regards

Hi all, I have done a lot of reading but still just as confused as when I started!! RB25det (neo) Forged internals, all the other good stuff. Haltech ECU. Plazmaman plenum with factor runners, DBW 68mm throttle body. 98 pump gas Should be capable of revving to 9k. Going to be used for mostly road/odd track day, 500WHP target. Looking at a Artec manifold with G30-770 but with the reading I have done, a lot of people recommend twin scroll. Not a lot of options with the G series when going to twin scroll. Garrett say not to worry about twin scroll? With response being important for drivability on the road, not top-end HP (while still important), what do people recommend for turbo? I like how easy the V-band g-series look and am keen on a g-series but not 100% sold. Also, recommendations for an intercooler. Historically I've always run cheap large ones but looking for something smaller and more efficient, capable of flowing the 500WHP. Thanks