maxpower_454

iTrader: (7)

I just got a good deal on a set of TFS 215's but would have to save up for a FAST 90 or 92 so I'm debating just sticking with the LS6. How much would an LS6 intake be holding me back with TFS 215 heads?

Also on a side note, why are FAST 90-92 going for as much or more than FAST 102's?

parks450

iTrader: (17)

It is going to hurt you a bit, but since you can't do much about it you'll be fine. I would suggest a 102 with those heads as they are a better design and will yield more HP. Exspecially since the 102's are cheaper, people think the 90/92's are gold because they no longer make them. In my .02 they should be around $500-600 but that's just me. People say you spend a lot more going to a 102 because of the different used parts. Fact is you can budget shop, example:
New 102: $800 shipped
ls2/3 rails: got mine for $30 off eBay, normally $100 ish
Ls2 injectors: $100 or so, or buy a rail adaptor for your stock ones: $50-70

It equals to about the same amount and you have a better intake with a better design, in turn yielding more HP

flintwrench69

iTrader: (11)

I would guess around 20 whp.
One reason is they dont make them, another is they work so damn well. I could really benefit from one as well but knowing how much they are havent even been looking to buy one. Its not just the intake, you need a bigger TB & possibly bigger MAF that drives the price up that much more.

ctd

iTrader: (1)

What drives the price of the Fast 90/92 is they fit C5's nicely. The 102 hits the firewall in many cases on the C5.

Box to box the 102 is much better the 90/92.

Nice heads you picked up! Save up for the 102, it will shine with 215's!

MikeWS6

I wouldnt worry about it. The ls6 is a great intake and there is always going to be something thats better and makes alittle more power.

BrntWS6

iTrader: (7)

If you look hard you can still find deals on 90/92's. I'd suggest a 92mm TB for either intake so it doesn't hit the water pump like the 102 TB usually does. I gained 19rwhp with my FAST 92 on 2.5 LS6 heads. I'd say you'd gain a good 25 possibly as much as 30rwhp with your setup.

But yeah, you also have to factor in the cost of a FTP lid, bigger MAF, bellows and touch up tune when going to a FAST setup.

flintwrench69

iTrader: (11)

Cmon man why did you have to say that? Youre costing me more money.

desertLS1

iTrader: (8)

LOL you def need a FAST

Blk98Vert

iTrader: (2)

A lot, easily 20 considering Ive seen several gains of that on stock ported head/cam cars that ran an LS6. And to answer your question they are retailing for that high because 90% of the LS world is naive when it comes to intake manifolds and have no understanding of how they work. When my source has them available I can get a 90 for $500, which is what they are worth

mark21742

The best way to see just how much power it will cost you sticking with the ls6 intake is to bolt the heads on, run them and see how much vacuum you are pulling at full throttle...if you are pulling a lot of vacuum then the FAST will show a big difference, if you are pulling little or no vacuum at full throttle then the ls6 intake is all you need and you would be wasting your money on the FAST.

Or, you could just box the new 215's up and give them to me...that way you won't spent any more money putting them on your car...just think of the money in bolts and gaskets alone I would save you

mark21742

To add a note, all the FAST intakes are way over priced, but where else can you take an hour or two to bolt on 20+ HP.....gotta pay to play

MikeWS6

Of course they are overpriced. People love dyno numbers though

Nissan LS240

iTrader: (1)

I thought a new FAST 92 was expensive then I saw one for sale that had body filler on it sanded and painted black with the direct port nitrous ran inside the intake they wanted like 1800 for that, sick looking intake looks like a ls6, but way too much.

Tally TransAm

iTrader: (17)

i just put together a car a couple months or so ago with an ls6 intake, vrx5, and as cast 220's. i wanna say it did 447/415. told him i though a fast 92 was worth about 20 on his setup, yours should be similar

maxpower_454

iTrader: (7)

Well the heads were supposed to just need a cleanup but really needed to be milled about .015" which would make the chamber too small for me to use so I'm going with AI ported 243's. From what I've seen in the dyno section they make similar power.

If I stick with the LS6 intake, should I swap the TB or would the intake be the restriction?

dr_whigham

iTrader: (49)

Does that mean this particular pair of 215's are still available...

Blk98Vert

iTrader: (2)

The intake would be the restriction

mac62989

iTrader: (1)

Why not use one of AIs TFS programs?

http://advancedinduction.com/LSX/AiLSx230ccTFSHead.php