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Old 03-28-2004, 08:38 PM   #1
#522
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01 RS
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Default Exhaust bolt sizes

Looks like I'll be cutting the bolts off the header to cat connection so I can install my borla headers, anyone know the the nut and bolt specs? I know the head size is 14mm, but whats the length and bolt diameter? Do I need longer bolts since the borla flange is thicker? And finally, any particular grade needed? The car is back on the ground and I don't want to jack it back up until I have all the parts in hand.

Thanks,
Ron
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Old 03-28-2004, 10:04 PM   #2
BlkTS02
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If you're gonna be dropping the whole header / cat why not crack the bolts loose when it's on the ground and you can get some leverage?

I think the diameter of the threaded section of the bolt is 8mm. Get a 15-20mm long bolt (not including the head) and you'll be fine.

I put in the best stuff home depot had ($.50 a bolt or so) to help prevent rusting and such.

Good luck
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Old 03-29-2004, 12:02 AM   #3
munkis
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Mine came off with out a problem at 98k miles.

You should be able to get them off without breaking them.

If you do break or cut them off, just use what ever you can find at home depot thats the same size. Its not really critical. Or you could always get them from the dealer.

Jay
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Old 03-29-2004, 12:48 AM   #4
b_tapper
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I spent $8 at lowes for ss nuts, bolts, and washers for my exhaust..blah

seems subaru uses nuts that can only be used once now on the exhausts...grrr
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Old 03-29-2004, 12:52 AM   #5
imprezzakc
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Finally some power mods Ron ?
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Old 03-29-2004, 11:35 AM   #6
#522
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Thanks guys. I now plan to drop the whole thing, but I actually had more leverage under the car. I got an open end wrench on the bolt, then other end hooked on the tranny subframe (I guess that's what that was) and a socket on the other side. then, I used my foot and got the bolt turning. It moved about 1/16 of an inch out then kept turning but stopped moving. I'm guessing it's cross threaded. That's why I decided to stop and make sure I had everything on hand I might need.

Anyway, thanks again for the advice, and yes Kris, finaly a little boost in power. Not much, but it couldn't hurt
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Old 03-29-2004, 02:24 PM   #7
#522
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one more thing, when dropping the whole system, where do I disconnect the rear oxygen sensor from? I found he front sensor harness plug, but didn't see the rear. pics?

Thanks again,
Ron

Last edited by #522; 03-29-2004 at 02:33 PM.
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Old 03-29-2004, 03:46 PM   #8
imprezzakc
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I think if you track the rear o2 sensor wire the disconnect should be near the pass side drive axel if I am not mistaken . Plus i had to cut the bolts on my stock header to cat to get it off. I just replaced the nuts and bolts with grade 5 replacements .
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Old 03-29-2004, 04:46 PM   #9
#522
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thanks.
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Old 03-30-2004, 12:11 PM   #10
#522
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Well that was fun. I lowered everything down, cut the bolts off and got the headers on no problem. 2 hours. 1 of it cutting and wrestling those bolts. At least everything is on now and no leaks. Home Depot once again plays a role in modding my car.

Ron
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