I would like to know what kind of plugs are the guys with turbos usung and at what gap? Also what is the widest tires that have been fitted on the stock 15 inch wheels. 235's?

 

.004" less for every 50hp you add. Also upto 100hp go with one step colder plugs, over 100hp go with 2step colder plugs.

Dixit

 

go with two step colder plugs, therefor you can boost on the top RPMs, and it should also help lower your EG temps.

 

Wouldn't a colder thermostat would probably help a bit as well?

 

Colder thermostat wont really help unless you have an issue where it always sits above the middle on the temp gauge while driving. If not then no need. Mine is fine when im Driving and in traffic. Except those times when the weather is really hot outside the temp gauge goes towards H and even then a colder thermostat wont help because at that point mine is open all the way anyways trying to get it cooled down.

Dixit