I was about to order some Idemitsu premix from RotaryPerformance and it's asking for my engine type. I did some research, but I want to make absolutely certain before ordering (unless it doesn't matter) but the 2005 RX-8 GT is the 13B Renisis engine right? Looking at wikis and on here and stuff, the only difference I see in the 13B vs the Renisis is in the ports and how many there are. So does it really make a difference?

 

Yea, all the same. If the car is completely stock you have a RX8. which is a 13B-R

 

ill help you before you get super flamed for it
unless your just pulling our legs and in that case...you got me

 

its actually 13B-MSP