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Originally Posted by 18ss376
I have proof, do you?
I have been dynoing engines since 1987, the avg. loss is 15h.p. I have a lot of dyno sheets that prove this on different CI of SBC engines. Feel free to stop by & I'll put a LT1 on the dyno & prove that 2" primaries LOSE h.p. over 1-7/8"
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I can't stop by Oklahoma from Tennessee but you are more than welcome to show me somehow on here and I will gladly say I was wrong. In this article from Superchevy it states to use 2 inches or greater for 500+ hp. I am not saying 2 inches is better than 1 7/8 at 500 or less but I just don't believe you will lose hp using 2 inches over 1 7/8 just not gain anything.
http://www.superchevy.com/how-to/eng...t-performance/
Also Joe at CPR recommends 2 inch headers on the new LT motors, said the 2 inch headers made more hp and tq across the rpm band.
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Originally Posted by Joe@CPR
ARH is the preferred brand here, we have installed 5 now and the fit and finish is perfect. 2'' is also the better option on the new LT motors. We make C7 longtubes and during our testing tried all 3 of the popular sizes and the 2'' made more hp/tq all across the rpm band so we decided to only do a 2''.
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Here back to back testing it says the 1 7/8 was better down low but the 2 inch did make more at 6000+ so the 2 inch still made more power.
https://www.camaro6.com/forums/showthread.php?t=472259
Here 2 basically identical cars were tested and the 2 inch headers made more also.
https://www.facebook.com/prayperform...type=3&theater