Im not going to argue about the gains you can see with THESE cams because i dont have any evidence. For all i know you could put them in and loose horsepower, but i can tell you that these are the cams that are going to the mondeo rally cars.
He does havea point that i wasnt being very descriptive about what you have to modify to get the power out of these so ill go into it a little bit.
First thing you need to make sure you have is a good place to take in cool air and be able to take in alot of it. A good CAI , box style with a cone inside would be the best, with lots of filter is all you need here.
Intake manifold shouldnt have to be modified at all to make good use of 3 of the 5 grinds available. The last 2 grinds need a diffrent manifold with shorter and larger volumn runners to make best use of it.
Fuel system starts to cut out at the 240 whp mark N/A with 19 lb injectors. So if your shooting higher then this you need to move up to the 24 lb. These should take you as far as n/a can while staying sane.
Head doesnt have to me modified at all. It flows great in stock form Although milling for compression would be advisable with the last 2 grinds as it will start to really eat away at your bottem end having a lower static compression with the big cams.
Exhaust needs to have a header system without cats if possible and a good low restriction muffling system. Youll see the biggest gains from these if you dont have to push through so much restriction. If your running the stock manifold with cats and a standard exhaust this isnt going to kill the effect of the cams but you wont see as much gain.
When you build an engine up you have to work the system up around it you know. Cant take a prostock 15:1 compression ratio 351 block making 4000 horsepower and put the stock intake manifold and exhaust pieces on it and expect it to make as near as much power.
But i mean if your ready to pay 1100 dollars for a fresh set of cams then you probably already have everything you need to take full advantage of these cams. Just basic bolt ons work great. If you have a 190 whp engine and you say for isntance went with the stage 3 set of cams you would probably conquer the 220-230 mark very easily. The best thing about putting a bigger cam in an engine is that it takes everything youv done to the engine to make it breath better and amplifies it. If you put a CAI on a stock cougar and made 6-7 horsepower then took and dropped that onto an engine with a highperformance cam that same cai will net you 9-10. Because the cam makes the engine breath so much better it really can use that extra airflow.
Looking at it from a stand point of just the zetec vrs the duratec. The zetecs are making 230 WHP on a whole liter less N/A no nitrous. The only thing they have available for their car that you dont is cams. Not to say that thats the only thing that is standing in your way of making big numbers. But the most horsepower ever recorded out of stock zetec cams is 140. So once cams hit the market for the zetec they gained 90 horsepower. So power went up 64% from the time that cams wernt available to when they were. If the same percent gain happened to the 2.5 you would see numbers at 310whp N/A and for the 3.0L 350 whp. Ofcourse this is gunna take intake manifolds headers fuel management and alot else to achieve that but this is the way to start getting there. Once these cams are released and people start tinkering with it power levels are going to go way up.
As for dyno`s No one that i know of has any yet and Ill never have a dyno for the 2.5L engine. I only have a 3.0L to dyno with. Thats why im opening these up at an on costs basis. Get some out there and get them turning some incredible numbers and people will come back and snatch them up at MSRP.