ARP HEADERS now i'm confused
 

My car is a 2001 SS camaro 6-speed stock.Not going to do any other mods,
heads cams etc.
I am going to purchase arp headers with their the catted y-pipe.
Does anyone have any dyno sheets or info on 1 3/4 vs 1 7/8?
All set to get 1 3/4 with dyno tune, when I was told that there have been comparison tests,
and even on the stock ls1 like mine better numbers could be gotten with the
1 7/8. Now I am looking for some input backed by facts.
Also what is the feeling on coated stainless steel headers vs non coated,
and its effect on a dyno tune?

There are quite a few threads on this and yes from what I've researched its stupid not to go 1 7/8. They don't lose power down low (from graphs I've seen) and the gain exponentially more vs 1 3/4 as you mod (i know you say you're not going to, but... even stock they made more power). Coating will just help keep heat in and I am sure its arguable about "scavenging" and similar from the heat in the runners, but essentially on a dynograph I couldn't imagine horsepower being gained from having them coated. Keeping heat down in an engine bay is a great thing however since other aspects of the tune can be affected by AIT and similar.

RS77,
Thanks for the quick reply.
i haven't stayed on top of this for a few years. I had always read 1 3/4 are
better for a stock situation.
Your response confirmed what i am being told now.

Yeah its an interesting concept why bigger wouldn't be better **fitment obviously comes into play when you get too large** when it comes to getting exhaust out of the car (if tuned properly) or how you could lose power from runners being too large.

As previously posted:


I guess I don't get why anyone would go bigger than 1 3/4? For this slightly beefed up '01 Camaro with HP/TQ: 1300/800, 1 3/4 was just FINE!:

http://www.gmhightechperformance.com...o_pistons.html

:gtfo:

Post your "PROOF"! Dyno pictures please, comparing BOTH. :D