Exhaust

[Morgy]

How many silencers would have been fitted as standard on a 289 sports. Mine has two in the centre section on each side and is fairly quiet on the road...
   
   I am looking into changing the exhaust fairly soon and would want it back too how it was Originally..

[rsk289]

Mark, leafspring cars had one box each side, under the seat area, not particularly big.  I'd have thought the coil spring cars had similar, but couldn't swear to it.  One clue would perhaps be the manifolds - according to Rinsey Mills, the Sports had the same cast iron manifolds as the earlier cars but with a longer intermediate pipe to compensate for the further forward engine position.  He says 'silencers and tailpipes were the same as on 427 street cars', so I'd guess similar again, one box each side.

[Rob.Hendriks]

Mark, here is a photo of the exhaust on 2700, don't know how similar it would be to a 289 sports, but would presume it to be close
   The original style oval box has was replaced with the flat box shown, as there were ground clearance issues going over sleeping policeman, speed bumps and some driveways. The flat box gains approx 30mm ground clearance and sounds great, it also passes 95 decibel noise check at 3000rpm
   The small chamber forward of the box is a cat converter that was fitted to pass UK emisions
   

[rsk289]

Is that a coil-spring chassis?  I've not seen that tubular rear crossmember before behind the diff, or the 'ear' diff mountings for that matter.  I hadn't realised the coilspring cars were that different from the leafspring chassis.
   Normally the tailpipe would have been straight to the back of the car from the box, but probably not with the ARB in the way like that!

[Rob.Hendriks]

Roger, it is a leaf spring chassis, the 50th anniversary car, hence the variations. The reason the pipe comes out where it does and not straight back, is to maximise the ground clearance, by taking advantage of the angle of the outrigger
   Think we're straying away from the original subject, so will leave it here

[rsk289]

Sorry Rob, I hadn't registered what car you had.  To steer back on topic, I'm pretty sure the AC289s also had a single box on each side, as Rob's (no cat though, obviously!).  Maybe a member with one can confirm?

[rodleach]

It is indeed just one oval box each side.
   
   I'd upload a photo of the underside of my 1964 Cobra 289 - COB 6034 - but don't seem to be able to ...

[MkIV Lux]

Mark,
   maybe one of the pictures of CSX2588 can help
   https://www.mecum.com/lots/CA0817-309063/1965-shelby-289-cobra-roadster/

[rstainer]

Mark,
   
   RSK289's first reply correctly reports 289 Sports silencers and tailpipes to be same as those on 427 street cars so I'd be wary of reading too much into leaf-spring (MkI chassis) Cobra photos such as 2588 and 6034.
   
   RS

[rsk289]

Sorry Robin, oops, should have signed it Roger
   
   Roger

[Rob.Hendriks]

Photo of Rod Leach's COB 6034 exhaust