Ok i have a question that probably has been answer a numerous of time but i wanted to see if anyone had answer for me. My question is does a turbo exhaust from the cat back fit on a NA Car, or does it fit if i would just put the y pipe on and the rest? yes i know the y pipe are only for dual exhaust and thats what i wanted. I have a 1990 N/A RX7 i have the model with the sunroof power everything, and idk if that even matter

 

is this just a dumb question or is it just noone wants to answer

 

i would still like to know bump

 

The main catalytic converter, y-pipe and mufflers can be interchanged between NA and TII cars. The stock TII cat-back is slightly better flowing than the NA version, and if you're talking about Racing Beat's cat-back systems, the TII version is larger diameter & will be louder.

 

Thank you sir thats what I was thinking but I just wasn't sure and me go buy a turbo exhaust and it not work out since turbo exhaust is all I can find really

 

Besides the typical larger tubing diameter, the turbo mufflers typically sacrifice noise suppression for flow. This works well on a turbocharged engine in which the turbine typically soaks up 40% of the noise and produces about 50% more exhaust gas. A non-turbo engine is much louder because it lacks the turbo, and a smaller-diameter exhaust system will help maintain the velocity of the smaller amount of exhaust, increasing engine performance.

Racing Beat makes a pretty good NA catback exhaust system:
http://www.racingbeat.com/RX7-1986-1...sts/16420.html

Dual exhaust doesn't really do much for a rotary engine, but you can piece together a dual system with Racing Beat ("Road Race") parts if that is what you want. Don't install an H-pipe. Keep the primaries no larger than 2" diameter. Only use mufflers that are intended for rotary engines or you will quickly blow them out.
http://www.racingbeat.com/RX7-1986-1...t-Systems.html