Longtube header size; Advice

[2011BLACK5OH]

Ok, so I've been trying to get my build ready for my 11 5.0. Ive came down to that I'm going to be running the Stage 2 intercooled P1SC1 procharger. Also ill be converting to E85.. Ill be running ARH long tubes with off road 3 in x pipe. I am not familiar with long tubes or headers at all even. I am trying to figure out what size primaries i should be running wether 1-3/4" or 1-7/8" ... my car is mainly a street car. help me out with some advice on which would be the better option, or if there is a better option.

 

[Nuar]

more air in, more air out.... 1 7/8 is my vote

 

[redline5.0]

1 7/8 for boosted setups or plans to go boost, if NA you could do either ones and supposedly make more power NA on the 1 3/4's but I have no proof of that.

 

[08mojo]

Just as the others have stated, go with 1 7/8" for boosted setups.

 

[beefcake]

yep, 1 7/8 is what i would do

let us know if you need help with your ARH purchase.

thanks
beef

 

[ExTurbo]

i picked up 29 horse and 18 ft lbs (peak) with more under the curve with the 1 7/8ths catless arh. honestly I think these cars like the larger diameter even without boost. I picked up close to 40 ft-lbs at like 3K so mid range tq only got better.