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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 11-14-2012, 11:00 PM   #1 (permalink)
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Twins crossover pipe question

I was looking at getting the D&D 2 into 2 pipe and i saw a comment online that said you "need" the crossover pipe on the stock exhaust or you will lose "at least 10 HP" if you remove the stock pipes and add pipes without a crossover. how accurate is this and will the D&D full exhaust system have a crossover?
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Old 11-14-2012, 11:12 PM   #2 (permalink)
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sorry guys i didn't search properly and found A LOT of threads reguarding this, looks like i will keep the crossover and get myself a pair or slipons instead.
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Old 11-15-2012, 03:53 PM   #3 (permalink)
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I went from a best run of 73.5 RWHP with the stock headers & D&D cans to a dialed in run of 76.5 RWHP with the D&D 2 into 2 system. The loss of 'at least 10 RWHP' by eliminating the cross over is likely BS spawned from folks who switched to something stupid - like open headers - or otherwise didn't take the time to dial in the new system to their machines state of tune.

Get the pipes that give you the aesthetic and aural effect you are looking for. Be warned, the D&D 2 into 2 full system is freakin' loud.

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Old 11-15-2012, 04:03 PM   #4 (permalink)
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Even D+D slip on's are freaking loud.
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Old 11-15-2012, 04:29 PM   #5 (permalink)
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I dont know who told you that bs but the d&ds are way better then the stock pipes.You will gain not loose.The headers on the d&d full system will stay looking nice longer to.If you like pretty get a polished set they look way way better then stock headers with slip on mufflers and they dont cost much more then slip on mufflers.They are alittle loud but sound way better then the slip on d&d.you get a real triumph twin sound with them.
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Old 11-15-2012, 04:37 PM   #6 (permalink)
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What my original play was the D&D 2-2 full system, air injection elim, airbox elim, removal of 02 sensors and a TTP tune #11. so you think I would gain more power with the full system instead of just getting Predator slip-ons?

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Old 11-15-2012, 05:04 PM   #7 (permalink)
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Yes...

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Old 11-16-2012, 06:49 PM   #8 (permalink)
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the crossover also used in cars aids midrange and quiets somewhat, some systems make more top hp but that is NOT where most of us drive
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Old 11-16-2012, 10:43 PM   #9 (permalink)
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The stock crossover is TOO far from the exhaust valves to accomplish what a properly designed crossover accomplishes, IMHO. I ran my '03 Bonnie with an exhaust system with NO crossover for a few thousand miles, and the torque and horsepower were both higher than with the stock headers with crossovers. The main thing is to get the jetting for the carbs proper (or the tune for EFI) when one makes changes. A good tuner with a dyno can separate the BS from reality rather easily.
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