what is the highest flowing intake for a 408ci ls1?

 

I'd use a FAST 90/90 setup.

 

sheet metal

 

where do you find the sheet metal ones?

 

My fast doesn`t keep up with the ET heads I have on my 408!

 

Agreed

 

They are custom made for your set up at performance shops.

 

Sheet metal intakes must be expensive. Afraid to ask how much.

 

If you want to go all-out, there's always the $3000-4000 Harrop intake

For most people, the FAST 90/90 works just fine, or a custom sheetmetal intake if you have the extra $1000 for an extra 10-15 rwhp.

Mike

 

I'd wager that a good carb-style intake with a 90degree elbow would flow some big numbers for less cost than a sheet-metal intake...

 

...and for less cost than a 90/90 Fast setup.

Ben T.

 

Wilson intake

 

I also think that you could port and polish AND get a nice SD tune on the carb-intake/elbow for less than a sheet metal intake, but you'll need a cowl hood, so that may be a limiting factor.

 

Agreed, that is a good route to go. If you really want to get the most out of your intake, let someone experienced do it right. By that I mean cutting it in half (the right way) porting and rewelding. A bit costly ~$1K on top of the intake, but you will have a bad mother when you are done.


Brandon

 

ls7 intake is cheap and outflows fast 90. gotta have $3k ET ls7 heads though.

 

Victor Jr. EFI intake all the way. Less than 400 bucks with fuel rails.