The stock turbo is MORE than capable of 400hp, give or take. An hx40 would be the next best thing worth like 40hp more over an 35 and a very common swap. Stock turbo with a good fp, afc tuning, gsk, intake and exhaust, and sticks are worth well over 400hp if tuned right

 

400 hp is not doable with an HX-35

 

i really didn't think that was possible either. i've already got a bhaf, 4" downpipe n 5 inch exhaust, no plate, rack plug, 4k gsk n the afc tuned. i really dont care what for numbers im makin. i just want a good set of upgraded injectors n a good towing turbo. im lookin for clean power so i dont want 370 marines or anything like that. and im also considering ditching goin plateless n goin to a #5 or 8. gonna bump the timing to 16 n im lookin at a set of those upgraded head bolts from the one sponsor on here.
on a side note im also getting rid of the annoying and far too common single stack in the bed n im going to fabricate some turn downs to come out at the corners of the rear bumper, n then some air bags too.
haha long to-do list

 

dont go with an hx 40, there junk. get a 62 or somthing similar from htt or a super b or whatever there called. not to big and spool fairly quick but still make healthy power.

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yes 400 horse is possible with a stocker, is it pretty? hell no, and this guy said he tows cows so im sure he wont like his egt's with a 400 horse truck with a stock charger. he will end up droppin a new motor in cause he will have burt the old one down with 15,000 degree egt's