Yes, GSmotorsports is running 6lbs of intercooled boost and making about 450 on the stock block, but then again they are running a centrifugal charger, which adds boost and power as the rpms climb. Much less strain on the motor, but still in the questionable levels. I had called them and asked about how the durability is going, with no problems so far, but then again, I ran about 11000 miles on my supercharged mustang, making about 400hp when finally one day getting on it the block cracked right down the middle. Cost me about $3500 to get a new block and forged internals and block girdles, for a short block build. Then I ran another 60,000 miles with that setup and more boost, making about 450hp, with no problems at all, until the car got totalled by a red light runner.
Even though the crank is cast, it maybe stronger than expected due to being a 5.7 crank, compared to a 5.0 crank. But on my second mustang I put a 347 stroker kit in that block, and when I compared the cranks, it didn't look any beefier than the stock crank. The new crank I used was a Eagle forged 5.7 crank cut down to a 5.4 throw crank, and larger pistons to get my 347cubes. So I don't know if this will be a problem, but when asking most engine builders, they say, "cast is cast" as if they are pretty much the same as strength goes. Now the argument is generally then how does a 460 or 400 crank put out 400plus hp without breaking. Well I say much larger cranks when looking at them. I have seen 600hp applications on 450cube and larger cranks that were cast, but they are like twice as thick!
Again when asking GS about the strength, they kind of give you that silent answer on the phone like they don't know themselfs for sure! Just like when I asked if the trannies could handle this power, they gave me the "Well, none have blown out so far!" answer.
Personally I am leaving it at Intake, Exhaust, and Headers, leaving the rest alone, if I could have afforded the SRT, I would have gotten that for sure. I haven't the headers yet, but the K&N intake, and Flowmaster exhaust gave a nice jump off the line, and it feels like it pulls MUCH stronger from mine and my friends seat of the pants dyno's! When at 4000miles and stock I could barely peel out in 80degree weather, maybe a foot of rubber when stomping on it. Now it is average 103 degrees here in Vegas, and it leaves a nice set of 10' strips on the ground now. When I can afford it I am getting the Dynamax headers, same as I had on my vette, and what I difference they made on the vette, and that had a pretty freeflowing stock exhaust, and I have heard people stating getting almost 40hp from them on the dodge. I had 299whp on my vette when stock, and after intake, exhaust and header, and computer tune, I was putting down 341whp. that was about a 50hp gain overall, so I believe that the same setup on the Dodge will get it to 390 to 400 crank hp, normally aspirated, which is less strainfull on the engine internals and drivetrain. I believe that this should hold up to the long run also, and for most people that would definately be enough!
