Aftermarket Intake Manifold Question

[Jakey]

So in my usual browsing through threads in different sites, I've been reading a fair amount about what appears to be the two most commonly used choices for intake mannys: Magnus & Forrester. I know that they both have their design pros and cons but that's not really my question. My question is that I've seen a few different posts where people have said that an aftermarket intake manifold should be towards the end of the priority list for modifications, why? If you already have a decent sized turbo with all the necessary supporting mods on your car, for example a 20G setup like Nash was running, why should an aftermarket intake manifold come after aftermarket internals? It looks to me like a 50 hp gain would be worth the 500-600 bucks if one wanted to stay away from forged pistons, rods, ....etc. Granted I could be running across people's opinions that are simply coinciding with each other or maybe I'm misunderstanding something in my readings?

Thanks!! :bounce:

[john]

Not sure but maybe they are assuming you will need forged pistons so you dont blow your engine. A 20g car on race gas and tuned right could make +400 hp. Add another 50 and your are risking engine damage.

[At-Least-It's-An-Evo]

Or maybe they're just assuming, "near the end of the mod list" means everything external/non internal parts. I know I'm doing an intake manifold before anything internal. Also, It'd be more beneficial if you have the ability to raise your rev limiter to take full advantage from it so therefore you're goig to have to semi build your head for it (springs/retainers). And like Vicious said, bigger better things will benefit more from the intakes.

[1ViciousGSX]

To take advantage of the added flow of an aftermarket intake like the Magnus or Forrerster you would want to have a larger turbo, bigger cams, exhaust, etc.

When people say it should be one of the last things, it usually comes from there being so many other mods that can be done first with good gains in performance.

[Goat Blower]

The factory mani's drop off around 6700 with a 20G or larger turbo, that's where the aftermarket mani makes the difference. To really make it worth it though, you need to raise the limiter so you can get an extra 1800 rpms of power instead of 800. At this point you're running into valve float issues if you have old worn out valve springs somewhere around 8000 rpms. That's why the intake is considered one of the last things, you need almost everything else to make it beneficial. The stocker is not that bad, people have gone 10's with it.