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[QUOTE="pwrstrk01, post: 1459057, member: 10528"] I had a tp38/gt4202 twin set up on my truck made 472/860 @ 1200* liked it a lot. changed out the 4202 for S475 that set up worked great too. now I have a GTP38/S475 setup. I have ran .84 1.0 and 1.15 exhaust housing, no waste gate, cross drilled a 1.0 gtp38 factory style waste gate, a 38 mm waste gate, a 44 mm waste gate, gated the atmospheric turbo. I have played with this set up a lot of different ways, listened to a lot of people say that their singles will out perform it, they made more power with a single blah blah blah... I now have a GTP38, with a billet WW2, 360* thrust, 1.0 housing and a 38mm external waste gate and a 475 with a billet wheel, 360* thrust, 1.25 T4 exhaust housing and I finally upgraded to 3 inch intakes. I haven't had this truck on a dyno in 4 years so I have no idea what it is making for HP, but I know that this set up is the best it has ever ran. makes 45 psi boost and 48 psi drive pressure. I can put a truck on my 30ft flat bed and pull anywhere I want in MT and not have to worry about looking at the pyro..EVER! now I didn't build this truck for all out horse power I built it to tow and it does that very well. I will also add that if you are just looking for towing set up GTP38 (with a cross drill factory waste gate on a 1.0 housing)/475 set up will do really well until you get over 30-35 boost then the back pressure climbs very quickly to 60+. Also the 3 inch intakes help tremendously with off idle power, don't mess with any factory ones save some money and buy a set from irate. I think that's about it let me know if you have any questions I will try and get some pictures up in the next couple weeks [/QUOTE]
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