Question about class

[Niterunner77]

Hello to everyone. I have a question about what class I would go into after a certain change to my car. I am currently in STR and I drive an 01 Toyota MR2 Spyder. I am wanting to add either just an LSD to my stock 5 speed transmission or change over to a 6 speed transmission with LSD but here is my dilemma. The rules states that any mod done specially to the transmission has to be a mod that was an option from the US dealership if I am reading it correctly. The LSD and The 6 speed trans are both euro spec and only came on euro MR2 Spyders. Not an option in the US although it doesn't require any modification to put in my car. It just bolts directly in. If I can't stay in STR which class or classes would be an option for me? CSP?

-Brandon

[jbass1911]

My understanding is that differentials are free in str but you have to keep the same gear ratio.

K. Limited Slip Differentials
STS, STF: No limited slip differentials are permitted except for factory
standard viscous coupler type units.
STX, STU, STR: Only standard (as defined in Section 12) limited slip
differentials (LSD) are allowed on AWD vehicles. For AWD vehicles
that did not come with any type of limited slip differential (including
center differential or transfer case), a single aftermarket mechanical
LSD may be added. .2WD vehicles may use any mechanical LSD unit

[rodhx]

Josh is correct. As long as you do not change the gear ratios you can add a limited slip in STR. You cannot change the transmission.

Since the 6 speed was never offered in the US I think that makes it illegal for Street Prepared. I am going to guess doing the trans swap takes you to SSM or perhaps Prepared.