SS Oval 350mm (measured more like 36cm can length) Works with my pannier rack - makes a nice non-offensive burble (without baffle installed) - powerwise, it doesn't feel to lose any horsies (not had it on a dyno for a before and after). 'Scuse dirty bike!
if you still have the silencer chamber under the swinging arm fitted the rear silencer does not need to do much silencing. I have a Benelli silencer fitted on my TA650 and it is probably as quiet as standard. It is more economic with Benelli fitted but is feels it gives a slight loss of bottom end and freer reving higher up, only noticeable after the change over. Far lighter than the Honda original. Many sport bike silencers would probably do the job I used a pair of Yamaha R1 silencers on my SL350 as they are similar shape to the originals and added a baffle tube on the silencer inlet side
If the mid silencer chamber is left in place a simple tube would probably be adequate for some noise suppression but probably rubbish for performance & the MOT tester may not like a plain pipe hence a sport bike silencer that is light and gives a deep note to the exhaust. Removing the mid chamber is more effort.
You need 2>1 Y piece, I used a mini cooper (old type) Y piece on my VT500, may fit the TAs but then you may need to baffle the Y outlet before the straight through sport silencer if you want to do a DIY job.
Sport silencers can be had cheaply at bike jumbles paid £15 for my Benelli one 3-4 years ago and £20 for the pair of R1 silencers this year.
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