KTM 500EXC Performance Upgrade Review — FMF 4.1 RCT, JD Jetting Tuner, Reed Delete/Euro Boot

Cost: ~$700

Rating: 4.5/5

How much better is this 2017 KTM 500 EXC-f after adding the FMF 4.1 RCT pipe, JD Jetting Power Surge Fueling Tuner, and Euro Intake Boot (intake reed delete) mods? —— SO MUCH BETTER!

Here are the 5 things that drastically improved with these performance modifications:

1. EASIER STARTING @ 2:28
2. BETTER SOUND @ 4:05
3. AMAZING POWER @ 6:11
4. OVERALL BETTER/CLEANER RUNNING ENGINE @ 8:28
5. WEIGHT LOSS @ 11:08

We talk about each one of these gains from these three (well 4, emissions too) modifications. Overall this can be done for under $800 and makes for a much better bike. Many of the tuners out there also have a cheaper version of this that just uses an end cap for the stock pipe versus going for the FMF Pipe and makes this modification under $600. Blais Racing calls it the Budget Performance Conversion.

We highly recommend doing these mods to your KTM 500EXC/Husky FE501, but just make sure your riding style/primary terrain means you should remove the intake reeds. If you like doing slow/hard enduro riding, you might be better leaving the reeds in to keep bottom end grunt.

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