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cobra is probably more of a speed exhaust, and dg is a torque monster for trails. all around i would buy DG cause they provide alot of torque for woods and don't hurt your top speed at all, maybe a little faster
I couldn't help you on that one, my friend has one on his 230 and i usually go pick him up and i've never heard his run without mine running and i cna't hear his over mine so i'de say even-DGlouder