Honda Grom Stage 3 | DHM Piston, ECU Reflash, and TB Camshaft

DH Motoring

Sale price $275.00 Regular price $335.00

Shipping calculated at checkout.

Customer Reviews

Based on 41 reviews
Cody G
Worth the money…

Easy to install and worth the power and response.

Victor Rivera

Honda Grom Stage 3 | DHM Piston, ECU Reflash, and TB Camshaft

Kevin G
Great performance

Only only 100 hard miles on it and loving the performance difference. Can’t speak enough about the tune and how well it’s made. No hiccups throughout the rev range, great idle and partial throttle. If monkeys and groms came like this from factory they would get made fun of a lot less. Install was great and only took about 3 hours working at a slow pace. My brother loves Honda OEM and thought i was crazy for modifying and Honda but he’s convinced it’s a worth while upgrade and couldn’t believe it was under $300 shipped. 5 stars.

Luis A Rodriguez
Noticeable differences for the money very happy with my purchase

I am 6.0 ft, 220 pounds and with this stage 3 kit i can do over 70mph on stock gearing and i dont have to down shift going up hill. I have the chimera intake and amazon exhaust and my 2020 grom feels great

Jesse Fife
Night and Day difference.

This is how they should come from the factory.

The DH Motoring Stage 3 Package includes the following:

  • DHM ECU Flash
  • DHM High Compression Stock Bore Piston
  • TB Camshaft
  • NGK CR9E Spark plug with spacer

Combined with your aftermarket intake and exhaust, this is the most you can get out of your Grom without doing any head work. After dyno testing we were repeatedly seeing 13.5hp at the wheels (SAE) run after run! The Stage 3 package makes more power than a stock Grom at every RPM and double the horsepower at 9000+ rpm! 91 octane fuel is absolutely required. Any fuel with a lower octane rating may result in engine damage!

You can choose to receive a preflashed ECU instead of sending yours in ($95 extra), or you can send yours in to be flashed.