Engine Masters - X vs H vs Straight Exhaust

The whole point that everyone is missing is that X pipes drop ~3dB. X-pipes make more power because you can use a free-er flowing muffler that would otherwise be twice as loud. Also the formulas for best H vs X pipe placement are different. Once the ideal collector length is established, the H pipe goes halfway down the ideal collector. (even open collectors benefit from this) X-pipes go where the end of the ideal collector is. Throwing a couple band or V clamps pre and post the X completely gets rid of the "oh no my transmission is trapped problems. If you want to sound like a blatty Harley, straight pipes are for you.