The exhaust is compatible all the way to the downpipe to the USDM WRX/Sti. The front Oxygen sensor has been relocated after the turbo, in the downpipe. The rainwater downpipe headers which collect from the roof gutters are each embossed with dates. The water drains into a gutter that is fed into a downpipe. As a rule of thumb a gutter with a single downpipe will drain a roof. Damp tower with much vegetation growth and problem downpipe on the north side. The house is dated "1721" on the lead downpipe straps. A downpipe has been retained in the southwestern wall on the first floor.