Date: Mon, 31 Jan 94 9:04:20 PST
From: Graeme Harrison
>They claim that I'll get better performance from
the deul system but I believe that
>there's too much cross air flow with that center
piece that goes between the two
>single pipes.Thus, I am looking for someone
who has the original two-into-one
>system but wants to run deul exhaust instead.
Once again, I would like to get a hold
>of a 1979 Bonni Special two-into-one exhaust
system.
Years ago, my housemate and I removed the stock exhaust systems from our '72 T120R and '73 T140RV then installed aftermarket 2-1 systems.
Yes, the power is better, but only at the upper rpm range. We actually lost some performance at the lower end and mid-range where the majority of our riding was conducted.
In short, about the only way to take advantage of the 2-1 system was to abuse the bikes. Those 2-1 systems didn't have header brackets, just a single muffler bracket and the flanges at the head. As a result of this arrangement, the muffler bracket was always breaking. Finally, we yanked them off, tossed them into the garbage and went with the dual exhaust equipped with Dunstall silencers. No crossover pipe btw the headers.
To many of us, including die-hards, a Triumph twin with dual silencers looks more balanced rather than lopsided on one side as with that 2-1 for T140Ds ... so, speaking from experience, unless seeking originality go with duals as best all-around exhaust system in performance and beauty. While Dunstalls haven't been available for years, Mean Marshalls Motorcycles in Oakland in Oakland, CA 510/834-6335 or FAX 510/834-6337 does carry Dunstall replicas and Tim Keane purchased a set from them.
Perhaps Tim could comment on those vs the Dunstalls that came with the '68 TR6R ... too bad they have road rash, but that shouldn't impact the performance and sound from which a valid comparism can be made. The Boa Constrictor mufflers on oem Triumphs have a nice, mellow sound, but hardly the best silencers as far as performance goes.