ARH Headers Primary Size..
Thread Starter
Drifting
Joined: Jan 2005
Posts: 1,556
Likes: 276
From: Marshall Texas
ARH Headers Primary Size..
I'm having ARH headers with 1 3/4" primaries, cats, xpipe, and aFe CAI installed and tuned. My question is should I have the 1 7/8" primary size header installed. My tuner, installer said the 1 3/4" will support up to @700 hp.. I can't find any dyno results on long tube 1 3/4" headers. Thanks for your time and replies..
Melting Slicks
Joined: Nov 2014
Posts: 2,204
Likes: 17
From: Fayetteville North Carolina
St. Jude Donor '15
It depends on your future mods, if you plan to only do headers and intake then 1 3/4" will have great power/tq down low and good mid range. If you plan to do heads/cam or blower down the road then the 1 7/8" will shine in that combo.
I went 1 3/4" because most of the time my car is in the low to mid range rpm, and I don't plan to do any big engine mods. I called ARH and they specifically said to use 1 3/4" if I don't plan to do a blower or heads/cam etc.
I went 1 3/4" because most of the time my car is in the low to mid range rpm, and I don't plan to do any big engine mods. I called ARH and they specifically said to use 1 3/4" if I don't plan to do a blower or heads/cam etc.
Pro
Joined: Apr 2015
Posts: 580
Likes: 44
I have made over 1000whp through cheap *** texas speed 1.75" primary headers and that was 5+ years ago. People get really hung up on this header thing. I run 2" primariy ARH units now on a couple different cars because at that level you need that most flow you can get, but the bottom line is that they will indeed be fine for 90% of the people that buy them.
Burning Brakes
Joined: Jul 2000
Posts: 761
Likes: 0
From: Tucson AZ
It depends on your future mods, if you plan to only do headers and intake then 1 3/4" will have great power/tq down low and good mid range. If you plan to do heads/cam or blower down the road then the 1 7/8" will shine in that combo.
I went 1 3/4" because most of the time my car is in the low to mid range rpm, and I don't plan to do any big engine mods. I called ARH and they specifically said to use 1 3/4" if I don't plan to do a blower or heads/cam etc.
I went 1 3/4" because most of the time my car is in the low to mid range rpm, and I don't plan to do any big engine mods. I called ARH and they specifically said to use 1 3/4" if I don't plan to do a blower or heads/cam etc.
Thread Starter
Drifting
Joined: Jan 2005
Posts: 1,556
Likes: 276
From: Marshall Texas
Thanks for all your replies, I may have made a mistake. Ordered ARH 1 7/8" with cats and xpipe. Hope it works out with the aFe CAI and tune. I'll let you know the results in a couple weeks. Hope for 450hp/450tq at the wheels.. 2014 Z51/ M7
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Racer
Joined: May 2014
Posts: 362
Likes: 31
From: WNY
I have the ARH LT's with AFE and tune and the car runs great. I was having the same dilemma when I ordered and decided to go with the 1 7/8 "just in case" and I'm glad I did. I was happy with just headers and tune for about a month. My ECS kit shipped yesterday.
Thread Starter
Drifting
Joined: Jan 2005
Posts: 1,556
Likes: 276
From: Marshall Texas
Racer
Joined: May 2014
Posts: 362
Likes: 31
From: WNY
My tuning was done on a Mustang dyno so my numbers were 385/391 stock(just AFE) and 408/434 with headers/AFE and tune.
Thread Starter
Drifting
Joined: Jan 2005
Posts: 1,556
Likes: 276
From: Marshall Texas
Pro
Joined: Jan 2013
Posts: 567
Likes: 28
From: Arizona
Normally, would go with 1-3/4", unless you're talking real high HP. But guys here post that these cars are different because of the DI and VVT.
And for a centrifugal blower car, the smaller header tube size will force the boost to come on sooner, from what I understand. That would be a good thing for a stock displacement motor. For a stroker, not so much.
And for a centrifugal blower car, the smaller header tube size will force the boost to come on sooner, from what I understand. That would be a good thing for a stock displacement motor. For a stroker, not so much.
Melting Slicks
Joined: Nov 2014
Posts: 2,204
Likes: 17
From: Fayetteville North Carolina
St. Jude Donor '15
Normally, would go with 1-3/4", unless you're talking real high HP. But guys here post that these cars are different because of the DI and VVT.
And for a centrifugal blower car, the smaller header tube size will force the boost to come on sooner, from what I understand. That would be a good thing for a stock displacement motor. For a stroker, not so much.
And for a centrifugal blower car, the smaller header tube size will force the boost to come on sooner, from what I understand. That would be a good thing for a stock displacement motor. For a stroker, not so much.
Thread Starter
Drifting
Joined: Jan 2005
Posts: 1,556
Likes: 276
From: Marshall Texas
Melting Slicks
Joined: Nov 2014
Posts: 2,204
Likes: 17
From: Fayetteville North Carolina
St. Jude Donor '15