HOP UPS
MIP Stinger tuned pipe
MIP STINGER
I added the tuned pipe so
the engine would run a little
cooler and found that this also
helped with the all around performace of the truck. It also doesn't fall off  when the suspension arm hits it, like the stock pipe.
Steel spur gear and  clutch bell
I replaced these due to wear.  I bent the  chassis and did not realize it until the gears had worn uneaven.  The steel spur gear has a lot more spinning weight than the stock plastic one.  If the slipper clutch is tight I am sure this would do some damage to the transmission.
15t clutchbell #SH4066      52t steel spur gear #SH4126
Pro line tires
The proline tires made quite a bit of difference in the handling.  Mainly cornering in loose dirt.  They are not as big as the stock tires so landings from big jumps can be a little harder.
pro-line front and rear tires
Air filter
I dont know about other kits, but the stock air filter was a joke on the Duratrax.  In fact it may have contributed to the piston and sleeve wearing out prematurly.
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