Gamble686, out of curiosity, if IAT's were a problem, how much more of a problem do you think the intake will make at WOT? Lets say the pre intake IAT is 100*, how much do you figure the intake will raise that temp before it hits the cylinder head runner?

I'm interested in what you think a post intake manifold temp would be when the pre manifold IAT is 100*, 150* and 200*.

 

While driving is really not a problem. Never has been. The issue is if you drive for a while, shut it down for 10-20 minutes, and come back and start it up intake temps will be 160ish and you might have a hard time starting.

 

I run a stock intake. I would put your money else where

 

Bunch of interesting comments I still can't get over the fact that no one but FAST makes a composite intake for these motors figured Holley or another manufacture would have made a effort

 

Yea I agree with you. It must be expensive to make/design the molds or something.

 

I still love my fast lsxrt. Tuning is tricky but once it's tuned 100% it's awesome. Install was a pain. I think mostly because I had never went to an aftermarket manifold before. Steam vent kit is a must. I have been running for a couple years and love it. Now I wanna add some type of F/I

 

been there done that ill never buy another LSXRT what a nightmare

 

I believe at wot the difference will be tiny or negligible. However, being a street driven vehicle my concern is on restarts and when the truck idles for long periods of time or when sitting on a starting line. Again it's not going to take a truck that typically has low iats into the stratosphere, my concern as many procharger guys have proven iats can be an issue and this won't help.

Exactly what I am trying to get across. Except as usually you did a better job explaining.

 

I see alot of 4.8's in here running the Holley hi ram. Is there actually any gain out of this on these small 4.8's? and if so is there any numbers to show for not just the butt dyno?

 

The thing that baffles me is why spend around $1000 on an intake when more cubes can be had for about that price with bigger gains. The only way I understand it is in the case of someone pushing a 4.8/5.3 to the absolute limit.