OEM part required 1 class
Intercooler assembly/housing replacement prohibited. · RRL.3.5
IJSBA · Forced induction
Aftermarket intercooler
The single cleanest Runabout Stock vs Limited discriminator.
Where it stands, class by class
14 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.
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.
OEM part required 1 class
Intercooler assembly and housing must remain · OEM
OEM part required 1 class
MUST REMAIN OEM. · RAS.3.6
Not permitted, not listed in the rules 4 classes
Not listed in this class document. Illegal under the closed-list principle.
- Fixed Steering Ski Stock · FSSK
- Ski Stock · SSK
- Ski Modified · SKM
- Ski Superstock · SKSS
The rules do not say 1 class
Not separately addressed.
Legal 3 classes
Explicitly permitted by this class document.
- Freestyle · FREST
- Ski Grand Prix · SKGP
- Sport GP · SPGP
Legal 1 class
Intercoolers may be modified or aftermarket. Mechanical intercooler pressure relief valves permitted. · RAL.5.1, RAL.3.6
Legal 1 class
RSS.6.2. Note the internal tension with RSS.3.5, which asks for the OEM intercooler housing for water-supply purposes.
- Runabout Superstock · RSS
Legal 1 class
ROP.8.2
- Runabout Open / GP · ROP
Aftermarket intercooler: 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 IJSBA class · where the rulebooks differ · signed checks on parts the shop sells.
Forced induction · four stroke · legal outright in 6 of 14