My mrs had a varex system on a turbo mx5 and when activated it was quieter than stock. However, butt-dyno performance felt down massively. Only used it when coming home in the early hours of the morning for the neighbours sake. Also, the controllers went out of code/butterfly failed after a year or so.

I have an extra resonator on my turboXS system and it is quieter than most whilst still sounding good.

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(2009 Hail write-off)

2010 Hatch
267 hp & 425nm ASG Dyno.