Which Nathans Twins to go with?
Depends on what your' goals are! I ran the stocker / gt 4202 for several months and if you tow or want more than 500 usable hp forget using the stocker. The biggest problem is drive pressures../egts. The set works great for daily driving and lites the same as stock, but put a load behind it or anything above 35 psi and drive pressures go through the roof. At 35-40 psi drive pressures were 70-80 and at 52-55 psi drive pressures were 100+. Due to pressures and temps I could barely tow with just my injectors 350 hp and could use no additional power. I spent many hours working on the wastegate and tuning with 0 results. My last attempt was to modify the exhaust housing on the stocker. This did help reduce some but overall the same issues were present high drive pressures and egts. I finally gave up and went with a II ps 62-12 as a sec which resolved all issues. Driive pressures are 1-1 at 55-60 psi, egts average 900 and with a load of 12k 1100 max and this was with additional power. When I was shopping last Oct, there were very few people running this set up and feed back was next to nothing with all not having a clue on drive pressures. Save yourself alot of grief and go with a larger sec over the gt 4202.
Judgeing from your other posts about turbos and lag and such I think the 62/65 over an S400 would be your best bet. It should spool nice and be enough air for 700. Also (I figure you are aware of this but I am unsure of costs) but you can just send your turbo in and have them put a 65 mm wheel in it and it may be cheaper.
I was also told that many times well before I bought my set with both the gt 4203 and 400 and the stocker. I run the gt 4202 and although I never ran the 400 I don't know. Since they are very similar in flow the 400 may be a little better but seriously doubt 1-1 @ 55. The exhaust housing on the sec was the problem, way too small to flow enough air. The modded sec turbo confirmed this along with many hours of tuneing.
So much info!!! Thanks everyone! Well after talking over things with the Mrs., I don't think I can afford anything over the stocker/S400 set-up and still be able to afford the injectors/studs/and springs, plus a couple little touches here and there. I e-mailed Nathan and asked him for some other prices, so we'll see. If I do go with the Stocker/S400, does this give me enough room to grow later? Would I be able to keep the S400 and replace the stocker with something else down the road?
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