Headers Size

[Cyber Gray]

Hi Guys,

Im planning to buy the SW LTs and wonder what size to go for 1 3/4 or 1 5/8 ?

Do they make the same hp ?

[Blade]

I have the 3/4 from ARH.......I don't think the size will make too much difference, 3/4 gives you more from what I hear.

I also don't know of anyone using 5/8 in a V6.

[Cyber Gray]

Originally Posted by Blade

I have the 3/4 from ARH.......I don't think the size will make too much difference, 3/4 gives you more from what I hear.

I also don't know of anyone using 5/8 in a V6.

Thanks man. You are always a good help.

I heard that the 1 3/4 gives more power at the low end than 1 5/8.

The problem is that 1 3/4 SW is out of stock now and I need to make a decision whether to go fpr 1 5/8 now or to wait for 2 weeks for the 1 3/4.

[LLT'MARO]

I've been thinking about this as well. Usually header sizing is a combination of engine size and power level. Too big and you'll kill low end power too small and high end power will be restricted.

For example and old school 350 gen I engine making around 250-300 hp would be best served by headers with 1&1/2 primaries up that power level to upper 300's then 1&5/8 come into the picture up that again then 1&3/4. There also stepped headers were they change the primary sizing.

Header primary length, collector sizing, and style of collectors come into the picture as well.

My though is that the 1&3/4 may be too big for the size/power level of a NA LLT, but we'd need to see a back to back dyno.

[bmorecam]

Theres alot of peoples using 1 5/8 tubing size ex.bbk.

I personally use 1 3/4 but most peoples wont need to go pass 5/8th. Theres an old saying that the bigger the piping you will lose more tq but gain top end and vice versa. SS did a test with different piping size from 5/8th to 2" and surprisingly 2" made the most power.

I think with our v6 you wont notice any difference so pick one.

[camaro4mybday]

You won't notice a difference on a stock motor. You start to see the differences on a moded motor especially fi

[CamaroC-17]

In worried my 3 Inch collectors make 'me lose power. The high flow cats are 3 inch as well then the back side of the cat goes to 2.5

[bmorecam]

camaroc5, ur fine.. the best thing to do is go and get on the dyno and come back here and post up your number so we can see if u lost or gained any power. it seems u been having lots of concern with ur setup.

[Cyber Gray]

Thanks guys for the help. To share with you some of the information that I recieved from xplosive performance.

The headers size really depends on the amount of air in the engine that depends on the mods on your car. Forced Induction, Cam, and Nitrous produce more air and require bigger headers to exist the air easily.

Stock to lightly modded cars you can go for 1 5/8 because the engine is not producing a lot of air.

[ROD1]

Originally Posted by Cyber Gray

Thanks guys for the help. To share with you some of the information that I recieved from xplosive performance.

The headers size really depends on the amount of air in the engine that depends on the mods on your car. Forced Induction, Cam, and Nitrous produce more air and require bigger headers to exist the air easily.

Stock to lightly modded cars you can go for 1 5/8 because the engine is not producing a lot of air.

I believe that most of us do not need to worry about getting big bore outlets even with FI. we are only pushing 3.6L of ignited compressed gas at only a slightly higher rate than the V8s are putting out. If you look at HDRS's 125 shot (450 HP) Nitrous run @ 11.9 using the stock manifold, downpipes/coverters and pipes.

[Cyber Gray]

Originally Posted by ROD1

I believe that most of us do not need to worry about getting big bore outlets even with FI. we are only pushing 3.6L of ignited compressed gas at only a slightly higher rate than the V8s are putting out. If you look at HDRS's 125 shot (450 HP) Nitrous run @ 11.9 using the stock manifold, downpipes/coverters and pipes.

Thanks for the info ROD.