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They are 13cm (5.25") both fronts & rears
I was running the standard HU for a while and yes they do sound much better, but Ive now got a new HU & CD changer which sounds even better.
p.s. a few of us are on JBL GTO-526es now and at under £40 a pair they are very good.
There are quite a few running 14s actually...
When my Cup was brand new, I ran 15.1 then 15.0secs dead at Santa Pod, with only 1250 miles on the clock, it was the hottest weekend of the year, the car was totally standard, not stripped and I had camping gear in the boot!
Then went to York...
Most Cups are running mid 14s with no or minimal mods and there are a few running 14.0 & 14.1secs with only simple "bolt on" mods, so nothing special tuning wise and there will be Cups & 172s in the 13s next season...