i have tried the vac u pan on the street they just do not work that good have had cranK CASE venting issues with it. with a ex it just will not work at hi RPMs when getting off it will blow the stick out and push oil out of the dipstick tube the back pressure or lack of draw shut the valves in the vac u pan and the crank case fines a way to vent also i have had low speed smoking where the engine was pushing more oil up on the walls and make it smoke this type of vent system was tried on a 462.468. 548 .572. never had any luck with it it could be made to work but i just use open breathers in let it do its thing and had never had any more issues with venting the case