H i all 2nd post on this forum but i often use it for good information,i have a HJ Monaro 4 door 1974 253 auto ,one previous owner and has a single exhaust system as standard fitment ,i would like to change this to a dual system ,can you still get the original twin factory set ups for the HJ?or am i looking at an aftermarket set? and what would be a rough price i would be expecting?Thanks for you help.
Yes you can. Just go to an exhaust shop that has an old guy that worked on exhausts in the 80's and they'll make you one. To make it look factory a factory dual exhaust 4 door has the same bracket that the exhaust hangs off on the driver's side replicated on the passenger side. They are on the body member forward of the diff. Factory installed ones were welded on but dealer fitted passenger side ones were bolted on. Just get up underneath and you'll see the bracket I mean.
Having said all that, i'd just fit a single 2.5" system. That is what i'm doing with my HJ Premier. Looks more original and sounds better too.
Last edited by HK1837; 15-12-2011 at 09:05 PM.
Thanks for the reply HK1837,so would a 2.5'' system sound just as good as a twin system if not better?
My 2 bob.... Go the single. I've gone from a twin to a single and glad I did. 2.5" to the muffler box and 3" from there out the back. My 253 has a very mild cam and the note was just smoother out the single. The 3 inch out the back lets you scare the birds when you need, but ride the throttle right and it drops down to a nice burble. Pay the dosh on a good sports box and it will make the difference and not sound like some try-hard with a straight-through.
The only con's was missing the look of the twin chrome droopys and the dual puffs of steam out the back on cold mornings.
Interesting,thanks Q ,i will look into that cheers mate.Quick pic of my car its stock standard ,regards Paul.
DSCF2229 - Copy.jpgDSCF2232 - Copy.jpg
Lovelly car! I'd love the identical car in a coupe.
Yeah me too and possibly another colour,i do like the LE Monaros .
Twin system all the way I say. Why mute a v8 with a single.
wbute,I believe 253s sound pretty good with a twin system,i have a standard single one fitted ,the motor is a standard one ,no fancy stuff just after the sound really and the look of a twin exhaust
253's can sound good with a twin, but they can also sound like a sick chook and cackle a lot. It all depends upon where the crossover is, pipe size etc. Singles have a deeper sound and avoid the chook noises. Also depends upon the cam and heads. One example of how the same exhaust can sound different with a different engine: my Overlander (red 308 TH400) was reasonably quiet with a 2.5" single (factory manifolds). I changed the engine to a bog standard VP 304 with maxitork manifold and carby off the red engine. Pipes were adjusted to match the EFI exhaust manifolds. The damn thing sounded like a V8 supercar, was so loud it'd give you a headache. Point is, every engine is different and what sounds good on a 308 may sound like cr@p on a 253. That's why I suggested you go and see an exhaust shop with an old fella that used to build exhausts for these.
There are currently 1 users browsing this thread. (0 members and 1 guests)
Posting Permissions
Reply With Quote
Bookmarks