like the title says, does anyone know if a dc 4-1 header for a 99-00 civic Si will bolt rite up to a 95 LS? Have anyone done this before?

 

it will at the head but not sure about the cat

 

all b series headers will fit it's just that the 4-1 has a 2.5" collector. So you'll need either a carsound cat or a 2.5" test pipe for it to fit properly. I just sold mines and I definately loss lowend power but my mid range and topend pulled on SI's all day when I was n/a. btw how much are you going to pay? I would suggest the 4-2-1 cause ls's can't rev to high.

 

my boy bought the header for 125 but since it wont fit then hell prolly sell it back to my other boy who has a 99 Si. So for sure it will not fit rite?

 

thats a hell of a deal! buy it and buy a 2.5" test pipe and your set.

 

all bseries headers will work bolt up to all b series heads
the only thing is some are londer than others which is a easy problem to fix nothing a muffler shop cant do

 

he was planning on to get custom piping....so can he use the header with stock cat and custom piping? so if its short den the shop can extend the b pipe so it can bolt rite on correct? Thanks for the help peeps.

 

Doesn't the DC 4-1 header have a 2.25" collector? I thought the ITR-JDM 4-1 had the 2.5" collector ?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98B18C1 &raquo;</TD></TR><TR><TD CLASS="quote">he was planning on to get custom piping....so can he use the header with stock cat and custom piping? so if its short den the shop can extend the b pipe so it can bolt rite on correct? Thanks for the help peeps.</TD></TR></TABLE>

Why does he want to use the stock cat? It doesn't make any sense. He's going to have a bottle neck at the cat... perhaps even making him slower.