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Thread: Tune the bike or the exhaust?

  1. #1
    monkeyboy Guest

    Default Tune the bike or the exhaust?

    I have a '05 fuel injected Dyna with some engine performance modifications. I just recently bought a Supertrapp 2 into 1 exhaust system. After I finished the engine modifications I had it tuned on a dyno using a PC-V and V & H straight shots. My question is: after I install the 2 into 1 exhaust, will I need to get it tuned again to compensate for the different exhaust or should I leave the "map" alone and tune the exhaust to the bike? The engine modifications include: bored to 98" with 10.5/1 pistons, Woods TW6 cams and "street port" heads. If it needs to be re-tuned after I install the new exhaust, how many discs should I start with? Again, if it doesn't need to go back on the dyno, how many discs should I start with? Thanks in advance for any insight you can provide.

  2. #2
    Join Date
    Aug 2008
    Blackfoot, ID


    IMO, if the only thing you're changing is the exhaust and you like the current power characteristics, just follow the SuperTrapp tuning FAQ instructions. I think once you do, you'll be surprised at how differently the bike feels at different disc settings. I know that's how it is with my sportbikes.

  3. #3
    Join Date
    Jul 2007


    As mentioned by KZ, put it on and try it first, start with 17-18 discs.

  4. #4
    monkeyboy Guest


    Okay guys. Thanks for your help and advise. I'll give it a shot and see what happens.

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