'05 YZ450F with TRC Yosh. system

[motomike03]

Got the exhaust and now bike will dominate anything at the dunes. My only questions is, How much horsepower did I pick up from the exhaust and the carb. kit installed?

Does anyone have a direction to point me?

[KJ790]

Odds are no more than 1 and a half peak. It is very rare for an exhaust system to produce more than 1 full peak horsepower more than a modern stock exhaust. The difference is in the rest of the curve.

[grayracer513]

Odds are no more than 1 and a half peak. It is very rare for an exhaust system to produce more than 1 full peak horsepower more than a modern stock exhaust. The difference is in the rest of the curve.

Essentially quite true. In fact, it would be unusual for any exhaust on a YZ450 to add more than 2 anywhere in the curve, either. The exception would be the '08-'09 models, which can easily gain as much as 5 or more in the mid range over the stock systems.