jfman

iTrader: (6)

Are all shorty headers 100% bolt ins ? Do they need new down/ypipes ?

miamifan3413

iTrader: (1)

They should bolt right on factory cats......mine did at least

300bhp/ton

They are bolt in, but there's no point in getting them IMO. Get LT's unless you are going FI then shorties become an acceptable alternative.

But shorties n/a is pretty pointless there's no real HP to gain by them. Just a lot of work to install.

INMY01TA

iTrader: (1)

What ^^ said.

Formy

Shorties may not be the best for performance but in some states you have to run them to be smog legal. Most bolt in with little fab and welding. My shorty Pacesetters bolted right up but I did need to weld a piece from the passenger cat to the header.

300bhp/ton

CA is a special case. In mre than way, j/k

But seriously. For a n/a setup you might aswell stick with stock manifolds. You will see almost the same HP (1-2hp in most cases) as you would with shorties.

Scavenging is where the power is at, not flow. For n/a setups the stock manifolds flow plenty, espcially considering you wont be running a wild cam either in CA for the same emission purposes. Shorties don't scavenge in the operational range of the LS1, hence little or no gain.

If you go FI, the flow is what matters and scavenging doesn't take place. So shorties will pretty much match LT's when used with FI.

jfman

iTrader: (6)

Does it matter turbo or SC ? Turbo is driven by the exhaust so shouldnt headers make them spool up quicker ?

Starz T/A 17

iTrader: (6)

yea with a supercharger Im pretty sure LT's are a lot better b/c a s/c is belt driver, if you use LT's with a turbo it will probally just cause more lag, but not 100% sure

300bhp/ton

As far as my understanding goes, no.

Scavenging doesn't take place when the intake air is being forced into the engine under higher than atmospheric pressure. So primary length of the header is not as critical. It's all about flow. Now some Lt's should out flow most shorties due to primary pipe diameter and collector size. But unless its one mean mother of a setup I doubt it would make many odds.

dailydriver

There are no front mounted turbo systems that even can use long tubes. STS rear mounted systems are another story. I don't know enough about them to comment on how LTs would work with those.