My mates 2004 STI Type UK Impreza has a stage 2 Prodrive backbox which is basically the same as mine on my WR1 but if you look inside it has no baffles and looks more un-restritcted.
Apparently it sounds better (although I thought it sounded quieter) and is better for performance. Can anyone confirm this as I might keep a look out on eBay!
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