search for the threads about removing the 987 vents.....one has the steps for the snorkel...I also read that on the 987 it causes a loss in power....not sure if that's accurate...
Desnorking doesn't work very well on a 987. Friend had his 986 desnorked, no problem. Got his 987 and desnorked noticed 50% drop in fuel mileage, put snork back in mileage back to normal.
Kevin