My dc sports stainless steel header for my 94 LX is finally on the way after a disaster with the kamikaze header and their horrible customer service.

My question is: how hard do the bolts get torqued when attaching the header to the engine. I imagine connecting the bottom half of the header and the header to the cat is pretty much just tightening it a reasonable amount. But connecting the flange to the engine, what torque would i need?

 

23 ft-lbs for the nuts. you'll also need i think it was a 21mm wrench to remove the O2 sensor fom your old manifold to put in the header.

 

your o2 sensor should be on a smaller section of piping and you shouldn't even have to touch it. the header will connect to this piece of piping.

 

i just installed headers on my V6 the other day,
looking back at it now it must be wayyy easier to install them on an i4!!

 

you mean on the down pipe? there's no o2 sensorthere. on 5th gens the o2 sensor is on the exhaust manifold. you have to remove it and put it in your header, otherwise you have a gaping hole in your exhaust, a pesky CEL, and your car will run like ass. trust me, i put the header on my 96 and it's the exact same thing.

 

i installed the header on my 94 ex. there is a piece of piping about 3-4 inches long that had the o2 sensor on it. it did not screw into the lower collector piece on the exhaust manifold.

 

oh, that's because the ex comes from the factory with a header, not that restrictive cast iron manifold.

 

what's the difference between the two?

 

the LX has a cheap die cast header, and its very restrictive

the EX has a ncie factory 4-2-1 header which results in the difference in HP between LX and EX

 

and the LX, which is what this guys is puttin his header on(swoosher21 read this next part), has the resrictive exhaust manifold, which in fact has an O2 sensor in it and will have to be removed and put into his new header. :thumbup: