659501 Muffler 3.5cc EFRA 2100

FX Royal Racing Engines EFRA 2100 tuned muffler.

This polished muffler is EFRA approved and recommended for high-RPM performance or more top speed. Specially designed and tuned to work with FX engines. EFRA number engraved.

Optional Manifolds:

• 659700 - Short Manifold, Small Radius
• 659701 - Medium Manifold, Small Radius
• 659702 -  Long Manifold, Small Radius

Manifold recommendations:

• Short Manifold: Recommended for tracks with long main straights to achieve the highest RPM, but with reduced bottom-end performance in the low RPM range.
• Medium Manifold: Recommended for medium (or “standard”) sized tracks.
• Long Manifold: Recommended for short tracks where bottom-end, lower-RPM performance is required.