WANTED S4 CATALYTIC
Captain Obvious
Super User
Super User
Joined: Aug 2003
Posts: 22,846
Likes: 348
From: Cambridge, Ontario, Canada
All 32V engines have the same catalytic coverters. It's a direct bolt on. As far as I know, all 16V engines need modifications to the passenger side of a 32V converter pipe to make it fit. It needs to be extended about an 1 inch or around 2.5cm.
Race Director
Joined: Sep 2007
Posts: 12,162
Likes: 383
From: Johnson City, TN
Depends on whether or not you utilize 32V headers.
If 16 V, I thought it bolted up but downpipes need to be heated at cat entry and bent a bit for width adjustment. IMO suggests an inch spacer or so.
If 32V tubulars, then you definitely need a couple inches of spacer. Slice off flange leaving 3/8 inch or so of tube on it, weld in a piece of SAE tubing. Again, heat pipes cherry red at cat and bend a bit to adjust width.
A 16V air pipe system will align with the 32V muffler air pipe and they bolt right up.
I thought the early 32V cat discharge pipes were different than S4. Are you sure IMO?
The 86.5 32V cat discharge looks same as S4.
If 16 V, I thought it bolted up but downpipes need to be heated at cat entry and bent a bit for width adjustment. IMO suggests an inch spacer or so.
If 32V tubulars, then you definitely need a couple inches of spacer. Slice off flange leaving 3/8 inch or so of tube on it, weld in a piece of SAE tubing. Again, heat pipes cherry red at cat and bend a bit to adjust width.
A 16V air pipe system will align with the 32V muffler air pipe and they bolt right up.
I thought the early 32V cat discharge pipes were different than S4. Are you sure IMO?
The 86.5 32V cat discharge looks same as S4.
Last edited by Landseer; Feb 21, 2013 at 08:46 AM.
Nordschleife Master
Joined: Jun 2006
Posts: 6,297
Likes: 63
From: ɹəpun uʍop 'ʎəupʎs
(86 is first year here in Oz which would require cats - which is why Australia for the S3 motor with cats in '86. I'd just prefer a 16V '86 instead for a change after owning a string of S4's).
Captain Obvious
Super User
Super User
Joined: Aug 2003
Posts: 22,846
Likes: 348
From: Cambridge, Ontario, Canada
Depends on whether or not you utilize 32V headers.
If 16 V, I thought it bolted up but downpipes need to be heated at cat entry and bent a bit for width adjustment. IMO suggests an inch spacer or so.
If 32V tubulars, then you definitely need a couple inches of spacer. Slice off flange leaving 3/8 inch or so of tube on it, weld in a piece of SAE tubing. Again, heat pipes cherry red at cat and bend a bit to adjust width.
A 16V air pipe system will align with the 32V muffler air pipe and they bolt right up.
I thought the early 32V cat discharge pipes were different than S4. Are you sure IMO?
The 86.5 32V cat discharge looks same as S4.
If 16 V, I thought it bolted up but downpipes need to be heated at cat entry and bent a bit for width adjustment. IMO suggests an inch spacer or so.
If 32V tubulars, then you definitely need a couple inches of spacer. Slice off flange leaving 3/8 inch or so of tube on it, weld in a piece of SAE tubing. Again, heat pipes cherry red at cat and bend a bit to adjust width.
A 16V air pipe system will align with the 32V muffler air pipe and they bolt right up.
I thought the early 32V cat discharge pipes were different than S4. Are you sure IMO?
The 86.5 32V cat discharge looks same as S4.
