the sti restrictor pill is 0.8mm the uk 1mm..
if you look into a sportscat they are not that restrictive.. usually knocks all of 5bhp off a 300bhp car using a sportscat rather than decat.
the issue is the open neck downpipe causing the boost to rise to boost cut as it spools.
thats ignoring the fact that the standard map is very advanced on timing and changing to a sportscat and therefore increased the boost it would be very wise to get it setup for it.
Simon
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