I've had my 300C one year now and love it. I have to change spark plugs and had a question. Are the Irridium plugs worth the price (about $8-10 each) and will they go 100K miles?

Also does anyone havea K n N filter installed? I was looking at the 57-1542 model which gives you a 21hp gain. If anyone is using this I would appreciate any feedback on them.

Thanks
-G

 

stick with champion plugs and no the sir filter will not give u a 21hp gain all chrysler are speed density systems and the amount of air flow into the engine has already been factored into the math. If u change the side of the throtle body intake and have a way to recalcuate the equasion then yeah u can gain HP. Or change the amount of fuel going in