sixt9er

iTrader: (2)

What are you guys running as far as header primaries and exhaust size after the header? Thanks for your input/advice.

LS1crazy01

iTrader: (14)

I think the usual is 1 7/8ths primarys and with either 3 inch true dual or a 4 inch Y pipe set up. I would go with the True dual for sure. I've been looking into this as well because I want to build one. It seems alot of people are getting by with the 1 3/4 primarys on the budget builds. And I think I might do that untill I got money for the 1 7/8ths since I already have headers. Also if you go to the Dyno section there is a sticky for 408 builds and there dyno numbers and set ups. Hope this helps some.

01ssreda4

iTrader: (96)

I agree.....

TA1364

iTrader: (11)

Where do u get a 3 inch true dual?

blk00ss

iTrader: (66)

Texas Speed, or cutsom.

candyblueta

iTrader: (16)

i run 1 7/8ths to a 3'' y pipe setup and it does pretty well on my 402 ls2 stroker

sixt9er

iTrader: (2)

I failed to mention that the 408 stroker is going into a 69 Nova, so it WILL be running a TRUE DUAL EXHAUST system. I'm just not sure of what size primary tubes to use and how big of a pipe to put behind the headers.

sixt9er

iTrader: (2)

Thanks for the input, by the way fellaz...

ExceSSive

iTrader: (13)

For the Nova I would do a 3" dual exhaust with X pipe. Put some bullets in it and you should be golden. Put dual cutouts in it for when you want to get rowdy...Is this a traditional SBC or LSX 408?

cryptnosis

iTrader: (7)

I run 1 3/4" on my LQ9,

Black Sunshine/ 00SS

iTrader: (1)

Why bother running cutouts along with the bullets, the gains will be minimal, if any.. I agree with the cutouts of he's going to run magnaflow, or some other quieter muffler.

1 7/8 on the headers, with a 3" dual exhaust will fit your needs, unless you are going procharger or turbo, in which case, larger would be better, like 3.5.

This, from someone who switches exhaust like most switch underware.. lol

A.R. Headers

Excessive, Go with 1-7/8" headers. I believe they'll net the best overall results. Go 3" with an X-pipe on the exhaust. I may have the headers for your combo. Let me know if you need more info. You can reach me at 631-608-1986. Thanks.

Nick

2000Hawk

iTrader: (5)

I saw 1-7/8" longtubes connected to a 3" x-pipe, and muffler wise a 408 would sound sweet with some magnaflow 4x9s.
-Joel

bowman2005

iTrader: (41)

Post a video when u get that novas exhaust on.

fatmat80

second that would love to see it!!!!