.boB

iTrader: (1)

What's the power difference at the top end between stock LS6 cast iron manifolds and a decent set shortie headers?

NW-99SS

iTrader: (6)

From what I've read, literally nothing. Save the money for a better mod or Long-tubes.

WS6wanted

Im not sure what the numbers are but if your looking for power, save your money for longtubes, y pipe and a tune. Shorties blooooooow

ULTIMATEORANGESS

iTrader: (4)

is there a reason why youre considering either of those manifolds?

.boB

iTrader: (1)

They're for a miata based car - very tight quarters. I can get corvette manifolds for <$100, shorties for $500, or long tubes for $1100.

NW-99SS

iTrader: (6)

2 options:

1. Pony up the extra cash or the LTs.
2. Save $400, get the Vette manifolds and use the cash for other mods.

Basically, shorties are all but worthless on LS engines - generally speaking.

ULTIMATEORANGESS

iTrader: (4)

I CHOOSE LTs for 1100.

madmike9396

iTrader: (29)

id do corvette manifolds unless its a max effort build. for 1100 you aren't gonna gain much hp.
that 1100 can be better used else where

.boB

iTrader: (1)

Any particular 'vette manifold better than another?

It's not a max effort build. Then engine is actually fairly mild. I agree, $1100 can make more improvements in other areas - like better brakes or suspension.

madmike9396

iTrader: (29)

if im not wrong I believe some factory manifolds do flow better than the others but im not sure which vehicle they came on. I want to say the vette.
I would do some searching on that

Blackpanther99

iTrader: (8)

^The newer the manifolds the better they flow is what most claim.

I wouldnt buy shorties at all.

FirstGen F-Body

iTrader: (3)

i would also go with LTs, but heres a test of vett manifolds vs 1 5/8 vs 1 3/4 LT vs 1 7/8 LThttp://www.carcraft.com/techarticles...t/viewall.html

NW-99SS

iTrader: (6)

Not 100% sure which Vette manifolds would flow better. I assume anything from an LS1-LS9 would bolt up?

FirstGen F-Body

iTrader: (3)

all LS's use the same Cometic gaskets
http://www.summitracing.com/parts/cg...et?prefilter=1

ULTIMATEORANGESS

iTrader: (4)

i still vote LTs.

99Bluz28

iTrader: (35)

IMO, unless there's some really good flowing/fitting LT headers for a ls1 conversion Miata I'd just get the corvette exhaust manifolds, You can always get LT headers later. Keep in mind that if you plan to put a performance cam in it give it a 4* to 8*(@.05") I/E duration split.