you can do the X or the H, either way is better than straight pipe
the short version
www.bumberas.com
www.motortrend.com
the short version
Bumbera's Performance


X-pipes and H-pipes Add Easy Horsepower
X-pipes and H-pipes add easy horsepower to your Chevy, but do you know which one is best for you? To find out, we hit up the industry experts.