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IMO they're overpriced slightly, very very nice, but they have their flaws. on the surface their clamping system is very good, BUT we've had problems with them blowing (this is on 172 cup racer) at the joints. and also it looks like they ran out of argon gas on some of the welds, maybe we've just got a "bad one"
surprisingly the race system for the 172 isn't that expensive
Its not so much the decat (althought the fitting is absolutley dyer, tryiong to reason with the guy was like pissing in the wind when I complained) It's more the crap way the Prospeed supports itself coupled with the ever reliable Renault exhaust rubbers. When I did get it sitting perfect it lasted about 3 months before it cracked the weld to the hanger on the back box......