i didnt say fibreglass is stronger, just easier to work with than carbon fibre.

tbh i just think the cracking and bits breaking off thing wouldnt be as much of a problem as some people might think, fibreglass is strong stuff, flexible and doesnt suffer from fatigue like metals do. fair enough, IF it cracked then thered be an issue, obviously, but i think itd take alot to crack one. back fire yeah, thatd probably do it. how often does that happen though when the engines already setup and timing is right?