The Triumph Dolomite Club - Discussion Forum

My sprint is fitted with a st/st straight exhaust. It is a little too throaty for my liking and I am thinking of changing to something more original. But the current exhaust is in good condition so I am inclined to put up with it.

What are the opinions on the pros and cons of the exhaust options.

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There are pretty much only 2 exhausts available for the Sprint as OE mild steel stuff is rarer than rocking horse poo.

There is the clubs (and one or two other) rendition of the standard system but in stainless steel, Usually a tad more raucous than a mild steel equivalent purely due to the resonating quality of stainless vs mild steel. But not shockingly noisy.

Alternatively you can have the Rimmer Bros Stainless Sports system. Which is what I suspect you have fitted. There used to be several others making a similar product but most if not all (certainly all I know of) have dropped out of the running. This system has a MUCH better gasflow than the OE design and comprises 2 straight through boxes that between them, keep the sound output just below an only semi deafening 100db @4500rpm. I know this because i've been through the Castle Combe racing circuit noise test several times with one.

But there is also a thriving aftermarket in bespoke stainless exhaust for every make model, and occasion. What I would suggest is that you visit one of these establishments and get a section made to replace just the frontmost silencer with one that has some more stuffing in it! As its only a basic silencer with a foot or so of pipe either side, it shouldn't be too prohibitively expensive (my guess around £100) A club standard Sprint system is £681 and a Rimmer Sport system is now over £400. The 2 systems cannot be "mixed and matched".

Steve

Another option (the one I used on the Spitfire) is to find a straight section on the system, measure the diameter and get a simple "clamp in" resonator of the appropriate size. (Something like a jetex)
I found with the Spitfire it doesn't restrict flow much, doesn't make the exhaust much quieter, but makes it less unbearable at high rpm/speeds for longer periods (motorways, autobahn etc)

yorkshire_spam wrote: ↑Fri Feb 18, 2022 12:45 pm Another option (the one I used on the Spitfire) is to find a straight section on the system, measure the diameter and get a simple "clamp in" resonator of the appropriate size. (Something like a jetex)
I found with the Spitfire it doesn't restrict flow much, doesn't make the exhaust much quieter, but makes it less unbearable at high rpm/speeds for longer periods (motorways, autobahn etc)

The thing is Sam, there really isn't anywhere else under a Dolomite to put an extra silencer. which is why I suggested subbing a proper silencer for the straight through front box. this should shut it up considerably for minimum expense/effort.

The reason I advised the front box be replaced rather than the rear one is because the spec of the rear box has minimal effect on noise output, silenced, straight through, or plain no box at all, seems to make little difference.

Steve

On the Spitfire the jetex resonator is slim enough to sit below the prop between the chassis rails. Can't really comment on whether or not there's a suitable place on a Sprint system. It's not that much bigger diameter wise than just a straight pipe.