IJSBA · Fuel

Aftermarket intake manifold, IJSBA

IJSBA answers this part for 20 of its classes. 10 of those answers permit the part outright and 1 permit it with stated conditions, leaving 9 that do not. 4 are inferred from how the class is written rather than quoted from a rule naming this part.

This page is IJSBA only, and the bodies do not agree. The same part under IHRA and UIM. Which one applies to you is decided by whoever sanctions the race you enter.

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This is one body's answer, not the sport's. You are bound by whichever body sanctions the event you enter. If you race more than one series, build to the stricter answer. The differences are set out in the rulebook comparison.

Where it stands, class by class

20 classes, grouped where the same rule gives the same answer rather than listed one by one, because an answer that holds for a class usually holds for every class that borrows its rules.

What each answer below means

OEM part required

This comes off. Only the part the manufacturer fitted is allowed here.

Not permitted, not listed in the rules

Treat it as coming off. The class requires the craft to stay stock except where the rules allow otherwise, and this part is not on the list, so this is our reading rather than a rule we can quote at you.

Governed by the parent class

Answered by the parent class rather than here, and the parent is named in the answer.

Legal, with conditions

Keep it, but measure it: the rules permit this part only inside stated limits.

Legal

Keep it. The rules permit this part in this class.

OEM part required 1 class

Intake manifold alterations prohibited. · RRL.4.1

• Runabout Rec Lites

OEM part required 1 class

Intake manifold modification in any portion is prohibited, including screens, filters and spark suppressors.

• Four Stroke Ski Lites · FSKL

OEM part required 1 class

Intake manifold modifications prohibited.

• Runabout Naturally Aspirated · RNA

OEM part required 1 class

Every portion of a four-stroke intake manifold must remain as originally equipped, and the two-stroke fuel section lists no manifold change. · RAS.1.1, RAS.5.1

• Runabout Stock

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 Lites · SKL
• Ski Modified · SKM

Governed by the parent class 1 class

Runabout Limited does not restate this part. RAL.1.1 carries every Stock class provision into Limited unless a Limited rule says otherwise, so the answer is the Runabout Stock one. · RAL.1.1

• Runabout Limited

Legal, with conditions 1 class

Allowed on Polaris Hurricane, Kawasaki X2 05-07 and Yamaha Waveblaster. Sea-Doo HX must keep the OEM manifold with factory line connections aligned as from the factory.

• Sport Spec · section headings, no numbered rules

Legal 10 classes

Intake manifold assembly may be modified or aftermarket.

• Vintage Ski Limited · VSKL.4.1
• Ski Superstock · SKSS.5.3
• Vintage SC · VSC.4.1
• Vintage X2 · VX2.4.1
• Runabout Superstock · RSS.5.3, RSS.7.1
• Vintage Ski · VSK.4.1
• Freestyle · FREST.4.1, FREST.8.3
• Ski Grand Prix · SKGP.4.1, SKGP.8.3
• Sport GP · SPGP.6.3, SPGP.7.1
• Runabout Open / GP · ROP.5.3

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Aftermarket intake manifold: 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 · checks on parts the shop sells · how this site reads a rulebook.