$650 gets you an s472/83/1.1 t6. Save your money and sell your turbo and you'd be there!
And the s475 is only $50 more in the same configuration. T4 to t6 adapter and you wouldn't have to change up your hot pipe either.

 

I seen some guys on tech that went with the 1.32 housing and actually like it. From what I read the spool was only down a little but the top end was better.

 

So where do you find one of these s480's at for cheap?

 

call jose @ forcedinductions.com. You need at least a 75mm turbine, but personally I would run the 92/84mm turbine. BW advertises their turbines based on the inducer when most other companies base it on the exducer. The exducer is more important bc it's the bottle neck. The BW turbines are 83/75, 92/84, and 96/88. They also have the TM1 but you wont need that. I would say go T6 but if you want to stay T4 go with the s475 92mm turbine and biggest ar you can. For T6 Id say s475 92mm turbine and 1.10 ar. You could also opt for the s480 compressor, it will spool a tiny bit slower but with your displacement it may be what you want depending on how much hp you want. You really should do some math and look at the two compressor maps and see which one would be more efficient for your goals

 

I have the t6 1.32 on a 370, and it spools good at 4500 RPMs. When it spools hold on. Over the winter I will build a quick spool valve, but I dont feel that I really need it. I ended up getting mine from Kyle at KB Racing.

 

I've been trying to find maps for these. I want bigger power and right now from low boost to high boost the 6l doesn't seem to change much. The whistle gets louder but the pull doesn't really increase and neither does the injector duty cycle. I'm already running a 78mm compressor I can't see going down with it. I think I found a s480 map and it doesn't look like it likes to flow a lot at lower boost levels.

 

There is a HUGE difference between a T-netics with a 78mm compressor and a 68mm turbine, vs a BW with a 75mm compressor and a 83/75mm turbine. I have have this BW with the race cover and have made about 750rwhp with it at 15psi on a 6L, Stock48 I believe has ran one at about 22psi and maxed it out about 900 or so I think. The BW flows a ton more air then a T-netics.

 

^^^ He's right! Compare a TC78 housing with a BW housing, the BW is wayyy bigger flowing more air. The TC76/TC78 turbos are crap at anything over 12-14psi on a 6.0... Get a BW and forget the twins idea, you'll make all the power you want with a BW, plus they sound awesome and are LOUD!

 

I upgraded my TC76 to the cheap CX racing GT45 76mm and it gained HUGE power at 14psi, they're ball bearing and only costs about $600

 

I'm running that same turbo and it's insane! Wouldn't say better than a bw but it has big housings so it flows a lot!
It was a night and day difference when I went from the on3 76/64 small housing (small frame like turbinetics) and went to the cx gt45 80/77.5 with big frame. It's actually the same exact turbo magnum sells for $1150 but it's only $600