Not legal 3 classes
501.02.03.03
- Ski Division GP3 · 501.02
- Ski Juniors GP3.2 · 302.01 · borrows another class
- Ski Juniors GP3.3 · 302.01 · borrows another class
UIM · Exhaust
Aftermarket exhaust manifold / head pipe
UIM answers this part for 24 of its classes. 8 of those answers are permissions, with or without limits attached, and 16 are not. 5 are inferred from how the class is written rather than quoted from a rule naming this part. 8 are inherited from a parent class the rulebook points at.
Where it stands, class by class
24 classes, grouped by the answer rather than listed one by one, because an answer that holds for a class usually holds for every class that borrows its rules. 8 of them publish no component rules of their own and are marked below; for those, the link to the parent class is read from the categories table rather than stated in the rulebook.
Not permitted, not listed in the rules Our reading, not a rule we can quote at you. This class requires the craft to stay stock except where the rules allow otherwise, and this part is not on the list.
Not permitted, not listed in the rules 3 classes
No exhaust rule at all in · 502.01.
- Runabout GP4
- Runabout Juniors GP4 · borrows another class
- Runabout Ladies GP4 · borrows another class
Not permitted, not listed in the rules 2 classes
No exhaust article exists in · 501.01.
- Ski Division GP4
- Ski Juniors GP4 · borrows another class
Governed by the parent class 8 classes
No component rules are published for this class and no single parent class is named, so this part cannot be answered for it. That is an absence in the rulebook, not a permission.
- Endurance · 317.03
- Freestyle Amateur · 312
- Freestyle Free · 312
- Jet Raid · 317.01
- Offshore · 317.02
- Parallel Slalom · 313
- Ski Future Electric (SFE) · 302.01
- UIM Hydro-Fly · 900
Legal, within limits 3 classes
Free, EXCEPT that on forced-induction craft the exhaust manifold must be of the full circulating water type at all times when the engine is running. · 501.04.07
- Ski Division GP1
- Ski Ladies GP1 · borrows another class
- Ski Veterans GP1 · borrows another class
Legal, within limits 2 classes
Free, EXCEPT the full circulating water type requirement on forced-induction craft. · 502.04-07
- Runabout GP1
- Runabout Veterans GP1 · borrows another class
Legal, within limits 1 class
Two-stroke: prohibited (entirely of origin). Four-stroke: not specified, therefore stock under the closed list.
- Runabout GP3 · 502.02
Legal, within limits 1 class
Two-stroke: allowed. Four-stroke: not specified, therefore stock.
- Runabout GP2 · 502.03
Legal 1 class
501.03.03.07
- Ski Division GP2 · 501.03
Aftermarket exhaust manifold / head pipe: if the rule your class applies reads differently to you, or the rulebook has changed since this was read, ask. We answer with the section we read it from, or that we have not read it. Ask a rules question.
Every UIM class · where the rulebooks differ · signed checks on parts the shop sells.
Exhaust · two and four stroke · legal outright in 8 of 24