biggest headers

[Defiance GT]

I am looking for the biggest diameter headers so it will push out the most air. So does anyone know what's the best.

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[ct07gt]

I think any decent set of long tube headers will flow enough for you. What mods are you planning that you would need an unusually large diameter header? 1 3/4" primaries are about the biggest standard size you will find I think. American Racing headers are usually regarded as some of the best, but they are expensive.

 

[Defiance GT]

I plan to have it whippled and just wanted to figure some stuff out before.

I think any decent set of long tube headers will flow enough for you. What mods are you planning that you would need an unusually large diameter header? 1 3/4" primaries are about the biggest standard size you will find I think. American Racing headers are usually regarded as some of the best, but they are expensive.

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[lightblade]

1 5/8'' (normal size is fine for boosted), only gonna see an improvement with a larger diameter primary like the 1 3/4'' is high boost high hp applications(600+hp 15+ psi)