Not permitted, not listed in the rules 15 classes
On a closed list an unlisted modification is not permitted. · A.2.2, J.1
IHRA · Fuel
Aftermarket air intake or cold air system
IHRA answers this part for 24 of its classes. 6 of those answers are permissions, with or without limits attached, and 18 are not. 18 are inferred from how the class is written rather than quoted from a rule naming this part.
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.
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.
No rule, this is an open class Our reading, not a rule we can quote at you. This class carries no stock clause at all, so anything unlisted appears to be open. The rulebook does not say so in terms.
Legal, within limits 1 class
May connect to one side of the air vent connector only. · DD.1
Legal, within limits 1 class
Outside air allowed but must remain flush with the top deck. NO SCOOPS. · DD.3
Legal, within limits 1 class
Outside air flush with the top deck. No scoops. · DD.4
Legal 1 class
Cold air intake systems permitted. · W.3.3
Legal 1 class
Aftermarket permitted. · DD.2
Legal 1 class
May be located outside the hull. · DD.5
No rule, this is an open class 2 classes
The class states only what it bans and calls itself run what you brung, against a section DD preamble that says anything unlisted is illegal.
- Drag, Stand Up Unlimited · DD.10
- Drag, Unlimited · DD.6
No rule, this is an open class 1 class
No restriction in section CC, and CC.1 permits any modification it does not restrict.
- Freestyle · CC
Aftermarket air intake or cold air system: 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 IHRA class · where the rulebooks differ · signed checks on parts the shop sells.
Fuel · four stroke · legal outright in 6 of 24