KILLER-LS1

iTrader: (18)

Hey guys, im about to buy some 2.5" stainless tubing for my crossover, and Im wondering what wall thickness you guys are running. ive seen .049, .050, .065...

i can get the .050 super cheap but Im wondering if thats too thin?

Phil99vette

iTrader: (11)

Here is what you want for your crossover...
2.25", 16g, 3" Radi, 304SS
http://www.globaltecheng.com/Product...idproduct=3581

yelo04goat

iTrader: (11)

hey phil. where do you find 2.25 v bands??

i have looked before with not much avail

madmax4499

iTrader: (3)

I like the OBX V-bands Ebay! .065 SS pipe seems to be the norm.

yelo04goat

iTrader: (11)

and they have 2.25?? goin to look now..

Phil99vette

iTrader: (11)

I would do 2.5" collectors on the headers and use 2.5" v-bands tapered down to 2.25" with a conical transition from someone like Woolf.

Phil99vette

iTrader: (11)

On my setup, we use 3" collectors with 3" v-bands and a 3" to 2.5" taper to the tube.

Hotrod406

iTrader: (6)

Or you can have a muffler shop bump the ends up to 2.5.

Phil99vette

iTrader: (11)

You can, I like to have a longer taper than what they can do.

KILLER-LS1

iTrader: (18)

i feel like thats a little small for a 408ci and 91mm turbo. is there a calculation to figure out what size tube you need?

Phil99vette

iTrader: (11)

If you think 2.5" is small for 408/91, than my 2.5" on a 460" looking to make 2800hp is microscopic. The crossover is used to get the exhaust to the turbo, maintain drive pressure and minimize heat loss. 2.25" is not too small. I used 2.5" on my old motor(438/106) and made double the power your trying to make, spooled fast and had no backpressure issues out the back door. With a slightly smaller tube, you can up the AR on the turbine and have better spool and less backpressure on the top.