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Originally Posted by ALMN
An X pipe swap over a stock x pipe is not going to give you any gains, there is no magic behind it. If that was the case Chevy would have done it and rated these cars 465 hp instead of 455. Trust me on this.
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Then as an engineer you need to explain how I gained 85hp at the crank.
Because the numbers don't add up without the X-Pipe.
Or do you think I have a Unicorn that would have baselined at 420 rwhp stock?
You may be an engineer but numbers don't lie.
Where did I pick up the extra hp from stock if the X-Pipe did nothing?
Perhaps E85 added 50 rwhp instead of just the normal 30-35?
Or would you care to explain to Motortrend they are wrong?
https://www.motortrend.com/how-to/x-...inder%20faster.
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The X-pipe will usually make anywhere from two to four more horsepower than an H-pipe. The slight horsepower difference comes from the way the X-pipe creates a venturi effect, which helps pull the exhaust gases out of the cylinder faster.
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That said, I have stated previous you need to get a tune, and it does matter what other mods you have. When you consider LT headers cat delete and the X-Pipe with a tune, the numbers do add up showing the X-Pipe does in fact add power. And its not just mototrend that agrees with me but many other sites.
Even if we consider probability, statistically the odds are not in your favor of you being right. There are too many other sources that contradict what you have stated.
Further consideration:
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For much of the system, the exhaust gases leaving the LT1 remain separate. Two sets of 2.75” diameter piping and emissions equipment run in parallel to evacuate exhaust from both the left and right banks of the engine.
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https://www.mishimoto.com/engineerin...system-review/
I have a 3" X-Pipe so wider diameter = more exhaust flow. And the stock exhaust is not an X-Pipe.
It really is basic physics. Why do you think I'm so against the LT2 intake manifold which caps out at 95mm. Where as the Atomic Airforce caps out at 103mm. Combine that with a NW 103mm TB and you will see higher gains at the finish line, than the LT2 can provide. Especially considering the 2" Headers I have installed as opposed to 1 7/8ths even though I don't have a supercharger yet. Yes the LT2 is cheaper, but sometimes you do in fact get what you pay for.
My intention with my build is to possibly eliminate bottlenecking with the intake and exhaust to allow the engine to breath properly. Everyone knows a proper breathing engine produces power.