Putting on a DC 4-1 header into a practicallly stock 2000 LS.(Stock exhaust)
Do I need a new header gasket too? or is it just recommended?
Do I need any other modifications before this install?

Thanx

 

The flange on the cat is too small. YOu need to get a modified flange to accept the 2.5" collector.

Might as well get a 2.5" cat. IM SMSP for one.

 

Unless he's talking about the JDM 4-1, it will bolt right up to the stock cat. And yes, you should get a new exhaust manifold gasket, they're not that expensive. The donut gasket on your stock manifold should pop right off and you just slide it on the DC header.

 

what are your future plans??

u may want to consider 421

 

yeah its not the jdm, so it should bolt right on right?
whats the quickest way to get my hands on an exhaust maifold gasket?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ebelp &raquo;</TD></TR><TR><TD CLASS="quote">And yes, you should get a new exhaust manifold gasket, they're not that expensive. The donut gasket on your stock manifold should pop right off and you just slide it on the DC header.</TD></TR></TABLE>

Actually, I would recommend re-using the manifold gasket and replacing the donut gasket.

 

yea the non-jdms bolt right up, and you need not to buy a new gasket, the old one should be sufficient.

 

you should look into getting a 4-2-1 header. the ls is better at low end torque and the 4-2-1 will help you more. the 4-1 is better if you have vtech

 

i agree with above get a 4-2-1 i did and love mine lots of midrange for around town usage and not just peak high rpm power

 

I have an LS and have the same question.. its basically stock besides CAI, what would do me best? 4-2-1? or 4-1? for daily driving/occasional track use...

 

Re-use both gaskets, just be very careful when removing the donut gasket on the end of the collector...

Should be an easy install, I fit the headers underneeth the car and lifted them into place, with very little problems, you may need to angle them up, cuz it is tight with the 1 piece, have fun...

 

for the ls motor, the 4-2-1 setup is going to be more sufficient due to the fact the b18b is more concentrated on low end torque & mid range power. For upper range power the 4-1 is a better choice, those with the gsr and R should make use of that.

 

is the 4-2-1 a 2 piece or 1 piece header? and what brand should i look for in terms of quality & performance?