Hey Spin,

Thanks for the responses.

I have a stock C6 LS2 right now. Do I need to purchase the 90 mm or the 78 mm Intake. I'm not sure what throttle body came stock on my
LS2 90 vs 78)? Most website sell the 90 mm FAST, however, I do not want to have to buy a new throttle body. So it's pretty critical I order the right one.

My installer told me I just need the FAST Intake and the LS2 Adapter Kit which I assume to be the firewall mod kit. I assume if you do not get the kit, you will have a hole in the firewall? I also want to be able to reuse my Fuel Rail Covers which are custom painted.

 

This is sorta on topic.

i guess the question is

what will the fast get me over a ported LS2 intake?

i had a fast 90 on my SS camaro. i ended up selling it and going to
a LS6 intake.

personally, when i get the vette i've dreaming about. the fast intake
won't be on the shopping list.
that intake is not very impressive for what it costs, and what you have to do to it to make it work.

 

you need the 90mm version.

 

IMO, they should've already made one that custom fits the C6.
I would buy the one you describe, but I don't know about prices.
I would not buy the current FAST intake.

 

Here is a comparison of the PORTED FAST vs. a PORTED LS2:
bottom line is the great ported LS2 top line is a ported FAST


The midband gains of the ported FAST over the ported LS2 are an additional 20rwhp and the TQ gains down in the midband are even better.

In the above graph the only difference was the manifolds. 9rwhp and 17rwtq is the difference if you mistakenly reduce the numbers to what is at peak. At it highest gain it is 20rwhp and 25rwtq OVER the LS2. The power differences in the midband are staggering by comparrison to peak numbers. The top line is the FAST and LG headers with a tune and the botom is a ported LS2 with no other changes.

Some will still say the difference is "only 9hp" when in reality the above graph tells a very different story at 4500rpms. A ported LS2 is an accountant's choice, a ported FAST is a mechanic's choice.

The gains in the midband are at least as good as any set of headers which cost more. It is a bargain for the midband power especially for the real world street driving most people do. Peak numbers would not even remotely be felt if they were 20rwhp but when you are in the midband 20rwhp is a much higher percentage of the power that you can use at that rpm. Its a mod that s easily felt.

Be aware that the manifold changes airflow and will definitely require a tune. I saw a +10 change in the long term fuel trends which will definitely make you run very rich in WOT.

 

Thanks. It was not clear if I should order the 78 mm or the 90 mm FAST with my LS2 from any of the websites I visited. Most stock the 90 mm version but some stock the 78 mm. I did not want to make a mistake and order the wrong one and have to buy a new throttle body to fit. There are also many numerous adapter kits to choose from and no one vendor sells them all. I thought that was strange as well. I want to reinstall the Fuel Rail Covers - Will I at least need to purchase the LX Manifold to LS2 Fuel Rail Adapter Kit # 54026? Would anyone of you recommend spending the $48.00 for the firewall modification kit? Is the hole in the firewall visible?

From Spin's graph, the FAST definitely looks like a worthwhile mod. I'm not crazy about the color and having to cut the firewall, but the performance outweighs the draw backs.

 

Wow...that mid band torque will be very smile provoking indeed....Let me know when you are going to do Cameron's Ill bring Steak Sandwhiches and suds.

 

With the intake on the hole in the firewall will not be visible. I bought the firewall kit because it would bother me just knowing it was there. Also I thought when I heard firewall it meant cutting into the cab of the car, this does not do that as it cuts just under the wiper arm which is why the firewall kit can be a good deal because the wiper are supporting block is cut in 1/2 and the kit comes with an aluminum block that fits in its place to support the wiper assembly. The fuel rail covers fit on the car, I followed the suggestion of the board and took a dremel tool and shaved off just a touch so they would not rub on the intake.

Take some high temp paint for plastic and paint it the color you like. You could also grind off the FAST logo if you dont like that. I did so and posted a pic on the first page.

Myself and Miagi posted up quite a bit of info during our installs a few months ago. If I can help any just let me know and enjoy the mod as Spin says you can feel it.

 

there was a thread saying FAST is coming out with a C6 specific intake soon. Should I hold my breath

 

There is no indication of that, fast has denied that they are coming out with this. You can call them yourself and find out.

 

Really?

 

Sounds like a plan, craig I can only imagine the difference with the 4.10's reving to 4,500 rpm faster. The difference should be huge, I guess the 20-25 hp has a better SOTP feel versus the 3.42's? I can't wait. Like to run those c6 Z's all over again..

 

I have contacted FAST about this and have yet to get a response.


Cameron you have got to contact me when you get this done. I've been holding out but I'm getting more and more anctious. You and I have almost the exact same mods/dyno numbers so you'll kind of be my test bed for the FAST.

 

I will certainly feel you in on accurate Sotp feel.. stay tuned..

And BTW I am almost even with stock C6-Z's to triple digits with current set up, I would like to run these Z's after the FAST 90..Results will definitely be posted as are these curious Z's in the flesh..

 

Guess you can fill in the rest of the ----- with that response, guess I must be a comedian to have you rolled on your back like that..Tickle Tickle, you little funny guy you..

 

FAST LS6/2 are tried and true - so are carbs, but neither will find their way on my car. Personally, I would rather put my money in the heads and buy a cheap intake (ETP 4.0 / LS7). By the time tuners get cams dialed in on the L92's, FAST will have a complimentary intake and cathedral poerted heads will find their way into the history books.

 

GREAT POINT, however, I don't see that happening any time soon why?

They haven't even designed the Fast 90 for the LS2 direct bolt on without the firewall mod yet, I doubt they will go straight to the LS3 version with the L92 set up. If your theory holds water, then "Fast" is leaving many thousands of LS2 customers who don't want to cut into firewall stranded IMHO. That being said, Manufacturing the mold for both set ups simultaneously is somewhat far fetched due to astronomical $'s needed for production and manufacturing separate molds..

 

You use the stock 90mm and dont need to order another 90mm TB.

 

I think you already bought me enough meals and detailed my car. Sooner or later you have to take something in return.

 

I called them and verified there is no plan or plan to design a new one since the oldest C6's are still under warranty. There is no demand yet for a new model while all GTO's, trans ams, camaros, and all C5 corvettes use the existing model.

This statement is a false rumor. Dont go by threads, call for the facts.