my friend has a 90 RX7 convertible, non. turbo .....13b i think it has header strait into dual midpipe, no cat, with these cans on the end(loud as all hell) like 747 loud. 13cc motor > rx7 Hiabusha(SP) 13cc motor 8000 redline put stock busha mufflers on the car. we picked up the mufflers today. any one done anything like this if so let me know.