scapaldo said:
What resources say that? AFAIK there's no back to back dyno tests to prove which is better. I got a JMF because of all of the cracked Magnus's that I've seen lately.
BOOSTERchair said:
Depends on if you like takeing the manifold off to have it rewelded after every 25 psi pull. magnus is know for cracking, both the new and the old version
talonturbo2 said:
A local guy that is running the magnus said his cracked also and he's getting it reweld. Im looking towards the JMF manifold now because of the magnus cracking.
Everyone needs to lay off the Magnus cracking bandwagon... lol. There are a few things to consider, remember this is coming from a person that uses a Magnus at 35 psi and it has cracked and been rewelded. I believe if I would have bought a JMF at the same time (even though they were not avail. then) and put it through the same abuse and time it would have done the same.
Most of the Magnus manifolds you see that crack are older because they have been on the market alot longer. Mine is old, Marco told me mine is the 1st revision. It is well over 3 years old on a daily driven car. It has been on 3 cars, all of those cars ran over 30psi. It has seen lots of LOW 10 second passes. It cracked, big fucking deal... I pulled it off in 30 minutes and had the whole damn thing rewelded. I doubt you hear about newer Magnu mani cracking, am I saying they wont? No. They will maybe, later. So will a JMF, later. After they are a few years old. Think of all the heat cycles, hot, cold, hot cold. Then if they get any water splashed on them that part cools down really fast, expand, contract, expand, contract. Get the point? The stock manifold also has two braces our SMIM's do not incorporate. When we are talking about two very high quality SMIM's like a Magnus and a JMF I dont thing cracking should be considered.
That being said:
I think they are both great manifolds and great quality. I think the JMF plenum is a little bigger... depends on your setup on what one will work best for your application. Either one combined with some good cams is going to give you alot more airflow up top and that comes together to make you smile bigger:banana: