IHRA · Hull and handling
IHRA answers this part for 29 of its classes. 3 of those answers permit the part outright and 0 permit it with stated conditions, leaving 26 that do not. 4 of the ones that do not are classes we read as open rather than as refusing it. 26 are inferred from how the class is written rather than quoted from a rule naming this part.
29 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.
Not permitted, not listed in the rules 22 classes
On a closed list an unlisted modification is not permitted. · A.2.2, J.1
Legal 3 classes
Aftermarket bulkheads are permitted, with no material or design limit stated.
No rule, this is an open class 3 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.
No rule, this is an open class 1 class
No restriction in section CC, and CC.1 permits any modification it does not restrict.
Aftermarket bulkhead: 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 · checks on parts the shop sells · how this site reads a rulebook.
Hull and handling · two and four stroke · legal in 3 of 29 answered