I'm personally not the biggest fan of S300s in compound/triple setups as the valley charger/high pressure charger. They don't seem to take the abuse very well and IMO don't quite have the turbine flow to run without a gate.
Do you already have a S3/S4 compound kit? If not, have you thought about going S4/S4 compounds with something like a 464/484-485 or 467/87 and a 488/96 or 488/102?
Yep at this point 68mm/S484 could be interesting tooI don't have personal experience with the set-up your asking about but If I was going to be towing I would look at something that would spool better, 64-65 mm in the valley with a 483-485 should easily get you to 1,000 and tow a whole lot better than 369/488.
Guys have definitely made more power than you're goal with a 369sxe/488sxe setup. What generation truck? Depending on generation you may be able to do some sneaky stuff and use Smeding's housings where you wouldn't need to modify piping at all.I'm running S475/Stock for now. I have a good deal on a S369, that's why i tought about S369/S488.
Agreed, I jumped up to a 1.0 AR housing on the 369 and I am still up about 83psi vs 60 psi of boost.There is nothing wrong with an s300/s400 setup for your goals. I ran a 369/488 gated eetup before going to a 472/491 nongated and I will tell you first hand the 369 is a limiting factor. The exhaust side chokes ralative short of your goal and will need a gate to keep drive pressure in check. Compressor wheel is rather large for the turbine side and leaves a bit to be desired for spool up. My current 472/491 makes way more power effortlessly and spools just as good as the 369/488 did.
Personally, you already have the piping so drop in a 68mm VGT or 72mm VGT and an s485. You will meat your goals and still retain drivability. If you are set on swapping chargers/piping, a 366/485 will get there too and still drive very well. Even a 464/83/.90 & 485/96/1.1 would do wonders to maintain drivabikity and hit your goal easier than either of the 2 suggestions above.
Just my $0.02...
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