Burning oil

Here is the story. My bro just bought a 91 SI for $1700. it is clean inside and out (other than a dent on passenger side). the problem is that it burns oil like a mofo. its got custom straight piping with no muffler.so as you could imagine it is loud as hell. my question is will it have a hard time passing smog due to oil being burnt internally? my bro dont know shit about hondas. i think it could be valve seals. hopefully it is not his piston rings.

hondas burn a little oil naturaly, how much are you talking? also does it have a cat?

dam my car has the exact same proble it is completele stock. ok here it goes one day i changed my oil 3 days later with regular driving it was below the lower oil marker i was like wtf. i just changed the oil im sonfused what could be the problem

maybe ur oil pan is leaking - u probably need a valve job and new heads and replace the gaskets n all that great stuff...

its burning bout a quart and a half a week. oil pan is cool its not leaking .It does have a cat. and when you build rpms, it throws kinda blue smoke. im burning oil inside

dude same here and when you let off of the gas some times it comes out

valve seal treatments and highmilage oil tend to help a bit, but replacing the valve seals all together isn't a bad idea.

i think it has something to do with having engines with such long lives tho, volkswagens tend to use a lot of oil too

so the worst that it could be is the head i got ??