[dookie320]

actually the 4th gens didnt come with vtec. the ex headers will be a definite gain on an lx like VXCL said. the things that make an lx different from the ex in 4th gens performance-wise (under the hood) are

header
cam shaft
cam sprocket
muffler
dual stage intake

you should feel a difference if u swap out the ex header for your lx one. good luck. you can search for more info about it. some ppl have done it on HS. good luck

 

[dookie320]

It will not bolt to the Dx,Lx downpipe because it has a dual outlet. Need the downpipe also. I'm looking for one now. My cast one cracked. Wrecking yards don't want to pull it off the engines.
I didn't know that stuff about the different cams, sprockets, intake, thanks for the info.

no prob!