The Alchemist

iTrader: (19)

I'm currently making 15psi of boost at 6800 and my exhaust consists of original QTP 1 3/4 headers (standard merge collector) with a Kooks ORY into a Magnaflow catback.

Is it worth it to go with a set of 1 7/8" headers (ARH) vs. what I have?

mikh338

iTrader: (16)

not sure but i have a brand new set of TSP 1 7\8 never bolted on or used for sale if you are interested

The Alchemist

iTrader: (19)

PM me a price shipped to 18902.

No Juice

iTrader: (11)

I'm interested as well. What about a pair of cut outs in the y-pipe?

TheLS1Lover

I think you would pick up more going with a Flowmaster Merge or True Duals.

ajrothm

I honestly don't think you will see much...definitely NOT worth the money unless you got a steal on the headers.. Hell going to a 2" primary probably isnt worth much more..

I went from LG Super Pro 1 3/4" on my old stock motor/D1sc setup to 2" ARH on my new build, so it was not an apples to apples test to see header gains alone but...My gut instinct is I really didnt gain much at all from the header swap... Maybe 20hp or so in the 900hp area... Definitely not worth the $1600 it cost me for new headers/x pipe...

I will say the 2" ARH headers fit damn good though.

A buddy of mine just dynoed 816rwhp with a D1SC at 15 psi on a 402"/ported 243s with 1 3/4" headers from Breathless Performance in a C6/stick car... I thought it was DAMN good for a D1...

The Alchemist

iTrader: (19)

Thank you for this post. It's probably not worth it then. Hell, I'm still only commanding 14-15 degrees of timing, I bet I'd see more of a gain adding a degree or two than I would see from swapping headers, and all that requires is a few keystrokes. Before anyone screams about safety, I'm spraying meth/water, on a forged motor and don't get any knock, so going from 14 degrees to 16 or 17 isn't unsafe.

BOBS99SS

iTrader: (2)

I would think 1 7/8ths,and a nice true dual exhaust would net you some gains,my car pulled alot harder with duals vs the magnaflow,it depends though,if your trying to get every lil bit out of it, its worth it,if it was me i would just add a cutout and call it a day,and up the boost a bit lol,but im cheap

lemons12

iTrader: (71)

Kp says otherwise with 1 3/4 vs 1 7/8. I would go for it.

js2fst

iTrader: (12)

I thought kp said otherwise what did he say

lemons12

iTrader: (71)

He had posted the gains somewhere in one of his threads.. We swapped several pms back and forth, he recommended 1 7/8s with a very free flowing exhaust.

The Alchemist

iTrader: (19)

So some say it's worth it, other's say no. LOL, sounds clear as mud.

js2fst

iTrader: (12)

My dynatechs are trash so I am thinking about 1 7/8 with true duals

lemons12

iTrader: (71)

Not to argue... But the procharger gurus say 1 7/8... Others are mixed 1 3/4 vs 1 7/8... Id take my chances with the 1 7/8.

jjcamaro02

iTrader: (34)

I am running 93 octane with meth AFR is around 10.9 -11.2 with 18 degrees of timing. You will feel a big improvement going from 14 to 17 degrees. Just keep an eye on your plugs. Save your money on the headers for now.

allout06

iTrader: (11)

My tuner ran 18* timing in my D1 setup i had, 11.5ish AFR, no meth on 93 and i beat on it for a year.. i think a few more degrees of timing is where your gonna see an improvement.

Packy

iTrader: (11)

A year ago I switched my old Mac mid-lengths with an ORY out with some TSP 1 7/8 inch LT's with an ORY and gained 29 hp and 18 lb ft of torque. Nothing else was changed when I did this. Not quite apples to apples but I thought it was worth it.

Blackpanther99

iTrader: (8)

It will be worth it, I cant say you will see a HUGE difference but its been proven that 1 7/8s are better on the long run if you can I would do it.

The Alchemist

iTrader: (19)

Louis posted a few days ago the power of timing and showed that 2 degrees of timing was worth like 30 rwhp and torque. I think I'm going to get my sled on a dyno and see what I can do with the tune and go from there.

Packy

iTrader: (11)

Yeah that is still subjective to your particular set-up. I mainly changed them out because I pulled the tires once and the Mac's connected with the K-member causing a dent. Plus they were old and sad looking. I was happy with the results. I also changed nothing with the tune on mine since doing the swap.