I heard it's good to drill the thermostat to relieve pressure or something like that, where do you drill and how big?? or should i just install it the way it came?? it's a Mr. gasket 180 by the way if it makes a difference.
Paul, it won't hurt to drill it. It arguably makes it take longer for the car to warm up (nothing you'd probably even notice). The extra holes are nice on craptastic t-stats but simply are not necessary on the perf. units.