whats the problem
 

i have a v4 sti and i recently noticed that the car has started to hesitate when it gets to around 4000rpm, i have recently fitted a silicone turbo inlet pipe and a large air box hose ( the car seemed to be fine before these were fitted ). and when i started the car this morning it blew blue smoke out the exhaust, (no smoke when driving or when turbo kicks in) just when you leave it stood then start it. :mad:
can anyone help????