Originally Posted by
houston
At stock shimming i would stay with the c5tgc personally , broader tuning window
Its not as if the plug change is a mandatory thing at 75° so you will be fine , if you lower the deck heighth by .10mm i would say stick a c6tgc in and git r dun
I guess I'll stock up on some 5's until it gets more into the Summer weather. Last weekend was my first time putting the 5 plug in and going from the 8mm to the 7mm venturi. I liked it but I still only have just the one i ordered with the engine.