Running duals from the headers back on my Regal, which pipe should I use? X or H? It's street driven and I won't be using cats.
Which is better, X pipe or H pipe?
- Thread starter GreenRegal87
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H gives you a lower tone, X gives you a higher tone, neither gives you any better performance...
I have ran both, the H pipe adds a slightly lower tone and makes it a tiny bit quieter. The X pipe is slightly higher toned, my custom 2.5" system on my 88 Cutlass with a compact X pipe and Aerochamber mufflers sound awesome. Both add power but only a handful of horsepower and torque with the H pipe more effective down low.
The only thing that sucks about going H pipe is no one makes a kit for it. It's all X pipe. That's why mine is true duals exiting out the side before the rear tire nascar style. Just 2.5 inch pipe about 4 feet long on either side, two 8 inch cherry bombs, and two 45 degree bends and chrome tips. 
I built the exhaust for my 500 Cadillac powered El Camino using a 2 ½” Pypes X pipe and Flowmaster tailpipes.
In most cases the difference in HP and Torque gains between straight duals, H pipe and X pipe can be measured on a dyno but is so insignificant at normal street driving RPM that there is no noticeable “seat of the pants feel”. When the factories started using H pipes back in the 60s it was done to reduce the noise level on dual exhaust cars.
I used the X pipe mostly because it tucks the mufflers up into the body nicely.
In most cases the difference in HP and Torque gains between straight duals, H pipe and X pipe can be measured on a dyno but is so insignificant at normal street driving RPM that there is no noticeable “seat of the pants feel”. When the factories started using H pipes back in the 60s it was done to reduce the noise level on dual exhaust cars.
I used the X pipe mostly because it tucks the mufflers up into the body nicely.
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I plan on using the pipes dual exhaust kit with X pipe and most likely their race pro mufflers.
I have used the 2.25" version of this kit before, also available in stainless and will be buying it again for my 70 S.
https://m.summitracing.com/parts/sum-642025
https://m.summitracing.com/parts/sum-642025
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