I don't think there is a lot you can do to the 3100 its basically the same as a 3400 and when I had my 3400s it was even hard to find just a Cold Air Intake so as far as modding the engine I dont think theres really a lot you can do, but Someone will correct me if I'm wronge.

 

really? im around jefferson park

 

I live by Wilson Park. I can't even find a cold air intake. I'm told that they don't make them for a 3100.

 

make your own. it's cheaper