when did you notice the leak? im not sure about the puff of smoke but mine was leaking out of the sump gasket when i got it. didnt notice tho as the guy i bought it from jet washed it everyweekend. then as i dont wash my cars more than twice a year the leak built up and strted to drip off which was when i noticed.
afaik the engine is notorious for sump gasket leak. and when i changed mine i changed the little o ring in the oil cooler adaptor plate.
couldn't tell you about the puff of smoke out the back. but it be to do with the oil breather, basically the sharp change in direction and gear change causes oil to be thrown back down the breather and this is burnt off, hence the puff of smoke. there are tonnes of threads about modding it to stop it. i could be wrong though.
Cool, i've been told that there is a breather mod which helps solve this as well?
yeah thinking about it. with the breather mod done, any oil that bets blown up the teh hose next to the dipstick will just go all over the cams, instead being blown round the breather system into the throttle body.