How would you expect adding 3 inches of neoprene tubing to two exhaust pipes to affect your carb settings,
Engine is a 30cc Homelite with Walbro carb.

1) Would you expect adding the tubing to make the high end richer, leaner, or no effect?

2) Would you expect adding the tubing to make the low end richer, leaner, or no effect?

Exhaust length without tubing is about 1 1/8";
Exhaust length with tubing is about 3 1/2"

The carb is set to run without the tubing.
After installing the tubing, the engine did not run as well.

Thanks.