quick question
does the ls header fit the si engine? (b18 bolt to the b16)

 

nobody knows??

 

yes it fits onto the head. the cat and exhaust may need to be modified though because the lengths of the exhausts are different from the header back.

 

its gonna sit taller.

Q:will it bolt up
A: Yes

Q: will it properly fit?
A: No

Q: Why
A: Cause the LS header will sit taller. If your car is dropped low, it will suck ***. Cant you just hear the metal to asphalt scraping already :grinno: Also im pretty sure your gonna have problems with the cat to header connection due to the LS header sitting taller.

Q:What would I do?
A: Buy the header and sell it on Ebay, then buy me a header that will fit and bolt up properly.

 

Good answer

 

you know...

 

I put a ls header on my old teg with a b16 swap and it fit fine. Actually it fit pretty snug against the oil pan.