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Going back to OEM exhaust

This is a discussion on Going back to OEM exhaust within the Grom Talk forums, part of the Honda Grom Forums category; First off I know I’ll lose some performance but, I want to give this a try. If I were to go back to the OEM ...

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Thread: Going back to OEM exhaust

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    Going back to OEM exhaust

    First off I know I’ll lose some performance but, I want to give this a try. If I were to go back to the OEM exhaust removing the Two Brothers Tarmac would it work ? Could I unplug the O2 sensor from the auto tune module, turn off the auto tune and run the bike on the current map the PCV has in it ? It would have no O2 sensor connected to the PCV / ECU at all. The bike would just be fueled by a map the auto tune had generated with the Two Brothers installed. Would this even work ? I ask because I’m just sick of the D*** noisy exhaust.
    2018 Grom:

    TB Parts 186bbk, DHM big valve ported head, TB Cam, Chimera intake, Two Brothers Tarmac exhaust, PCV / WB2, Seat Concepts, DRO Speedo healer, DID O ring chain, 16/34 gearing.

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    cant you get a db killer for it? or a can with one to retrofit? the stock pipe is a drinking straw and it will need to retune a LOT to work right. my .02
    kc4sox likes this.
    A bunch of old stuff that runs. 2stroke grom build...in process.. eventually...

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    Is Arrow the only aftermarket exhaust that comes with a db killer?

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    bbk + stock exhaust header.... you may as well remove the bbk as that stock pea shooter header will make the bbk pointless.

    Now if we are talking stock exhaust can with aftermarket bigger header (like on my build) it works well.

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    Did you gut the OEM can ?
    2018 Grom:

    TB Parts 186bbk, DHM big valve ported head, TB Cam, Chimera intake, Two Brothers Tarmac exhaust, PCV / WB2, Seat Concepts, DRO Speedo healer, DID O ring chain, 16/34 gearing.

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    i was curious, does the grom version have this feature "
    • Sound reducing "T-Tip" standard on Tarmac mufflers (removable)."

    it lists it. I'm assuming you have it in?
    A bunch of old stuff that runs. 2stroke grom build...in process.. eventually...

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    Quote Originally Posted by kc4sox View Post
    First off I know I’ll lose some performance but, I want to give this a try. If I were to go back to the OEM exhaust removing the Two Brothers Tarmac would it work ? Could I unplug the O2 sensor from the auto tune module, turn off the auto tune and run the bike on the current map the PCV has in it ? It would have no O2 sensor connected to the PCV / ECU at all. The bike would just be fueled by a map the auto tune had generated with the Two Brothers installed. Would this even work ? I ask because I’m just sick of the D*** noisy exhaust.
    If you want to go back, I highly recommend this free stock exhaust mod.

    Going back to OEM exhaust-img_1053.jpg

    Going back to OEM exhaust-img_1057.jpg

    Going back to OEM exhaust-img_1056.jpg

    This is how it sounds...



    The sound is just deeper and a tad bit louder than with the muffler. I'm not sure how much performance I gave up as the engine runs really good this way. The exhaust is also about one third lighter without that big heavy ugly muffler. It's all tucked away under the bike and nothing sticks out.
    Last edited by tooter; 03-25-2019 at 01:31 PM.
    2018 GROM: Modified for reliability longevity gas mileage... and fun.

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    Quote Originally Posted by kc4sox View Post
    Did you gut the OEM can ?
    naw. OEM can flows plenty for my 164... but the stock header even holds back the stock 125!

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    Quote Originally Posted by m in sc View Post
    i was curious, does the grom version have this feature "
    • Sound reducing "T-Tip" standard on Tarmac mufflers (removable)."

    it lists it. I'm assuming you have it in?

    Not for the Grom
    2018 Grom:

    TB Parts 186bbk, DHM big valve ported head, TB Cam, Chimera intake, Two Brothers Tarmac exhaust, PCV / WB2, Seat Concepts, DRO Speedo healer, DID O ring chain, 16/34 gearing.

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    Quote Originally Posted by nd4spdbh View Post
    naw. OEM can flows plenty for my 164... but the stock header even holds back the stock 125!

    When you get time would you mind posting a couple of pics of your exhaust ?
    2018 Grom:

    TB Parts 186bbk, DHM big valve ported head, TB Cam, Chimera intake, Two Brothers Tarmac exhaust, PCV / WB2, Seat Concepts, DRO Speedo healer, DID O ring chain, 16/34 gearing.

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