Ok guys, not to beat a dead horse or anything but we all know that any aftermarket (or oemfor that matter) integra header/exhaust manifold and downpipe will not work on a rt4wd crv without modification at the transfer case.

Heres my idea after searching high and low and finding nothing or any information at all, I want to ditch the puny stamped metal crv upper exhaust manifold for an OEM integra iron upper. Great. Heres the problem the 3 studs that run through the upper exhaust manifold into the lower header portion are spaced a bit further apart than the crv one. So I ended up cutting one of the outer studs off after much drilling to find that I wasnt going to have enough surface to drill to make the spacing far enough apart. After cutting off the outer stud, had to drill a new hole through the upper exhaust manifold to use a new bolt and nut. The two exhaust holes in the upper manifold and lower pipe seemed to line up great!
After the butt dyno road test the car seems to pick up way better in the lower rpms, all the way through the powerband. I was beginning to think my engine was taking a crap and just had no power anymore. This really made a great difference and it was free since I had all the stuff laying around.

UPDATE: DONE!!

Heres a comparison between the two manifolds. Its hard to tell but the b20 on the right has super small primaries compared to the integra on left.



Integra on the right, b20 on the left! Makes no power!!


b20 on the right, integra left, the b20 looks larger than it is because its closer to the camera in this shot. sorry.


One stud cut off and new hole drilled out actually drills through the old stud.




Initially, I was trying to drill out the holes large enough on the downpipe to accept the integra upper but ran out of metal. It just wont work.


Got it done, anyone have a integra heatshield for sale?

 

Why not just pound out or drill the old studs, drill the holes bigger, then use a bolt/nut combo with a modified gasket?

 

I am considering both. I could almost ovalize the two side holes on the lower header portion but its gonna need a good 1/8 inch on both holes

 

Well that's a lot better than welding, then use a hallow punch or something to make the gasket fit

 

The gasket is just the two crush rings. Im a bit worried they wont line up good anyhow

 

Just an update, the outer two holes cannot be drilled out enough to have any bite left to bolt the upper manifold on. After drilling both holes out to the maximum, I decided to cut one of the studs off and drill out a new hole. Will post a picture shortly but almost have this project done.

 

cool, glad to see you got it done.