Agency Power has just released their Subaru WRX exhausts and currently working on the prototype system for the 08 STI.  The exhaust is very similar to the WRX wagon exhaust except it has do exhaust exits.  Our prototype system features dual 4inch titanium tips.  However the production piece will include quad 2.5inch titanium tips similar to our BMW M3 exhaust.  We expect this available for sale in early September.  Contact us for more information.