CReed

Your throwed off shane but I remember that like it was only yesterday. Hows that stock tranny hanging on?

Xalot on MPI twins.

rustyshakelford

chris at relentless is awesome, very knowledgeable but kinda hard to get a hold of sometimes. ive heard nothing but good things about MPI too. i dont think youll go wrong with either of them

brett

Luvnacumns

Stock still and doing quite well.. Honestly I am surprised how it handles the power with just the twins... I really like driving it with just the twins...

Idaho CTD

What is big power? That is what you have to ask yourself first. For the cheapest date the stock turbo combo's are the best. If you plan on big power in the future then the S300/S400 combo's are the ticket. I rate the stock/S400 to 600-650hp, the 62mm S300's and 74mm S400's to 650-700hp, and the 62 or 64mm S300's and 80mm S400's to 800+. You can make more then that but your starting to run out of the efficiency range of the turbos past those numbers. That means it's getting hot (egt's) and the drive pressure is past 1 to 1. Also the late '06's and 07's run a bit hotter then the rest of the 3rd gen's. I wouldn't recommend the 80mm S400 combo's for towing unless your at low elevations and dont mind keeping the rpm's up a bit to help things stay cool.

MOJO1

Well now it is TIME to make the pick! I think i need to sleep on this everybody seems great with there TWINs just the price. Your only looking at a few bucks anyway you go.Relentless uses the stock turbo and MPI uses to new ones is this right?

moneytlks01

MPI can do either, they have a setup for the stock charger or complete custom build.

jrussell

The Relentless kit uses a stock turbo over an HT3B. MPI uses the stocker over an S400. The S400 moves more air and spools faster than the HT3B.

MOJO1

Wonder why MPI twins are higher then .Relentless twins?They seem to be allmost the same right?

GaveUpOnTV

external wastegate, which most here think is a substancial difference is not included in Relentless's kit.

MOJO1

Well i called Scheid diesel today on a set of Twins. They have beat everybody price on the true 2 turbo setup.Looks like i will go that way unless someone can change my mind. That was with a S300-S400 he said that was a strong set of Twins and all i would need.Is this true you guys know more about this then i do just want to do this ONE TIME!

jrussell

We've asked you a couple times...how much power are you looking for? It's impossible for anyone to give you advice on turbo sizes if you won't tell us what kind of power you're looking to make.

Luvnacumns

If you seen Nathan's fit and finish you wouldn't shop anywhere else!!

MOJO1

I would like to be in the high 5s mybe 6s if posible.jrussell sorry for not posting it earlier.

MOJO1

I think it is the same setup JOHN_P is running. Only if i could put down his numbers

jrussell

No problem man. To some people big power is 800+...it's all relative!

That's about what mines putting down right now and the stocker/S400 setup is PERFECT. My max EGT's on a normal WOT run are under 1350 with 50-55psi of boost. I never ran my truck stock down here at sea level, but spool-up seems about the same as it was with stock turbo and Smarty (FAST!).

I'm no expert and have no real experience with the S300/S400 setup, but at only 550-600hp I think they would be a little oversized. The great thing about the MPI stocker/S400 kit is that it's upgradeable to a S300/S400 kit. No wasted cash.