The majority of the homologated cars ran twin side exits, with cats....no silencers....very difficult to get through noise test and vunerable in the sticks.....
The rear exit version was still an option and as you can see on Mark Jaspers later (R6 FMC) car they ran a rear exit version on the works cars...mainly gravel cars...
These were titanium.....they ran down the offside of the car with the cross over at the back as per the pic of mine below....
Ian