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blueprinted engines, higher rev limit, more accurate maping, they're no more than 185bhp, i know the guy who looks after the engines for r-sport, they were all engine dyno'd with 2bhp of each other when new
right to clarify
ALL yozzasport exhausts (172 and 182) have a 2.5inch centre section
182 centre section has no silencer
all of the 172 centre sections have a small silencer (all bar the race version)
its just the back boxes that vary, they're all 2.5 inch centre section to back box, its the...
to do the job properly its knocking on for 7hours
loads of them leak, its very common, if its only a wee bit then just leave it
if its leaking through the bolts remove the offending bolt, squirt a bit of silicone in there and refit the bolt