2.5" downpipe -->> 3" cat : how does it work?
11-03-2002, 02:46 PM
#1
Honda-Tech Member
Thread Starter
Join Date: Feb 2000
Location: Vancouver, BC
Posts: 720
Likes: 0
Received 0 Likes
on
0 Posts
2.5" downpipe -->> 3" cat : how does it work?
I'm wondering what is the way to bolt up this junction?? Do I need to use a 3" flange on the downpipe or do I need a different flange on the 3" cat that would fit the 2.5" flange on the dp. Another way I heard is to flare the 2.5" dp to 3" at the end. TIA
11-03-2002, 03:38 PM
#3
Member
Join Date: Feb 2002
Location: Lat Long 32.90 97.03
Posts: 1,144
Likes: 0
Received 0 Likes
on
0 Posts
Re: 2.5" downpipe -->> 3" cat : how does it work? (BlackIntegraLS)
either you will have to flare the downpipe from 2.5 -> 3
-or-
redo the cat and have a 2.5 -> 3 adapter flange put on.
-or-
redo the cat and have a 2.5 -> 3 adapter flange put on.
11-03-2002, 05:46 PM
#5
New User
Join Date: Jul 2001
Location: virginia beach, virginia, usa
Posts: 628
Likes: 0
Received 0 Likes
on
0 Posts
Re: 2.5" downpipe -->> 3" cat : how does it work? (morepoop4u)
i have one for sale...standard drag downpipe..with welded 3inch straight pipe( NO CAT) with 02 bung welded on....pm me..make offer..its in great condition...
11-03-2002, 10:12 PM
#7
Honda-Tech Member
Join Date: Feb 2001
Location: Tejas
Posts: 6,351
Likes: 0
Received 0 Likes
on
0 Posts
Re: 2.5" downpipe -->> 3" cat : how does it work? (magicwand)
do this....
go to muffler shop, ask them for a 3" 3 bolts flange, then have them get a 2.5" piping about 3-4 inches long and have them use a pipe expander to make it 3", so now you have a 3" 3 bolts flange and 4" of piping flaring from 2.5 - 3"
have them weld the 3" side of the piping to the flange
now, go to autozne and get a flex exhaust kit, it's about 5 bucks, comes with 2 secure band...
hook up one side of the flex pipe to your DP and the other side to the 2.5" side of the flange
voila
stan
go to muffler shop, ask them for a 3" 3 bolts flange, then have them get a 2.5" piping about 3-4 inches long and have them use a pipe expander to make it 3", so now you have a 3" 3 bolts flange and 4" of piping flaring from 2.5 - 3"
have them weld the 3" side of the piping to the flange
now, go to autozne and get a flex exhaust kit, it's about 5 bucks, comes with 2 secure band...
hook up one side of the flex pipe to your DP and the other side to the 2.5" side of the flange
voila
stan
Trending Topics
11-04-2002, 10:05 AM
#8
Honda-Tech Member
Thread Starter
Join Date: Feb 2000
Location: Vancouver, BC
Posts: 720
Likes: 0
Received 0 Likes
on
0 Posts
Re: 2.5" downpipe -->> 3" cat : how does it work? (Flamenco-T)
thanks for the suggestions 
B18C-RnVA - thanks but I'm already gonna use a Max Rev dp
B18C-RnVA - thanks but I'm already gonna use a Max Rev dp
Thread
Thread Starter
Forum
Replies
Last Post
BlueShadow
Welding / Fabrication
9
05-20-2005 06:35 PM
xci_ed6
Honda CRX / EF Civic (1988 - 1991)
2
08-19-2002 06:17 PM
Etylorcen
Forced Induction
14
10-23-2001 11:55 AM
