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Hello again Jay mate, I've got the TD res fitted to my otherwise stock gt86 so if all goes well with picking up the light you could hear it then!

The compression ratio is 12:5:1. It's listed in the first link @BRZ-123 posted.

This. My partner hated the resonated version on both the N/A and the Turbo. The car was loud on the N/A kit and wasn't appreciated by heathens when on cold start. Generally couldn't listen to the radio without it almost being at full volume. I've only had the SR on the turbo, and is fairly quiet, listen to the radio on cruises, and allows you to hear the turbo do it's thing. It's also quiet enough to meet noise regs at tracks like Bedford (or I wasn't warned about it) but I know it was near the limit at Oulton Park on the N/A with the resonated. Personally, I would get the SR.

It sounds nice with the super-resonator, no drone on the motorway but still makes its presence known.

I have a question and think I know the answer but cannot find it. I take it Tetsuya Tada GT86 and GR Supra Chief Engineer had no involvement in this GR86 car? From design photos I did not see him and no mention. Obviously early days and he could either be busy on S58 engine GR Supra or manual GR Supra, or something else entirely but would be nice to see if he had any input in this.