Not legal 6 classes
Unless OEM-equipped.
- Drag, Sea-Doo vs Sea-Doo · DD.11
- Drag, Yamaha Pro Stock · DD.1
- Drag, Sea-Doo Pro Stock · DD.2
- Drag, Yamaha Spec · DD.3
- Drag, Sea-Doo Spec · DD.4
- Drag, Super Stock · DD.5
IHRA · Forced induction
Aftermarket turbocharger
Held apart from the supercharger because seven of the ten drag classes ban one and allow the other.
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.
Not permitted, not listed in the rules 11 classes
On a closed list an unlisted modification is not permitted. · A.2.2, J.1
Legal, within limits 1 class
Engines of 1100cc or less only, with a water-jacketed housing required, and it may be added to a craft that was naturally aspirated as built. · K.5.1
Legal, within limits 1 class
Four-stroke entries: Boost regulator mandatory. Water-jacketed housing required. Engines above 1100cc must remain naturally aspirated. Limits: max displacement 1100 cc, boost release psi under 900cc 12, boost release psi 901 to 1100cc 9. · V.6.1
Legal, within limits 1 class
Watercooled only. No hot headers. Limits: max inducer 68 mm. · DD.7
Legal 1 class
Power adders allowed. · DD.10
Legal 1 class
Full circulating water-jacket housing required while running. May be added to an originally NA four-stroke. · X.4.1
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
No rule, this is an open class 1 class
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, Unlimited · DD.6
Aftermarket turbocharger: 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.
Forced induction · four stroke · legal outright in 5 of 24