BlackNiteWS6

iTrader: (2)

How does everyone like their Mac headers with their ATI kit?
Also did anyone switch from Mac's to LT headers w/3" y-pipe? And if
so how much did you gain in the whole power band? I'm not just interested
in just peak hp & tq. I'm looking for people that switched and made more power thru out the whole powerband.
Thanks

52172

iTrader: (2)

There are not many people running the mac mids they are old school. I do know EPP got almost 700 rwhp and a D1 using short tube headers so you could do the same with the right combo.

BlackNiteWS6

iTrader: (2)

Damn 700 horses....I'm only looking for 550rwhp at most because i'll still have
stock bottom end. These are the parts i either have and others i need. Here's the list.
Parts:
Procharger w/D1SC and twin intercoolers
SD Concepts 8-rib belt tensioner
GTP Stage 1.5 6.0 heads with 2.02 intake 1.575 exhaust valves
TR Blower cam
Mac headers or Dynatech Supermaxx headers
Magnaflow muffler
85mm MAF
Stock ported TB
Upgrade to 3.42 gears
Sphon torque arm
Boxed rear control arms
Front upper&lower control arms
Interior gauges
beefed up A4
BMR weld in box subframes
And other stuff that i'll need
Vig.3200
Looking for 530rwhp to 550rwhp.

CHRISPY

You'll make tons of power with the MACs if you already have them I wouldnt get rid of them until they rust out

BlackNiteWS6

iTrader: (2)

Thanks everyone for your help. I sold my FLP's when i sold my WS6 so
now i wanna install my GTP 6.0 heads and my D1SC/twins kit very soon. And
i was going to just get a set of SuperMaxx's which replaced the FLP's but they cost a lot even though they are stainless, and i can get a new set of
Mac's with y-pipe both ceramic coated for half the price of SuperMaxx's.
And the money i save on the Mac's i can put into the SD Concepts 8-rib
tensioner system. Like you said, alot of my buddies had Mac's and they went
fast with them. Thanks i think u helped me make my descision.

skyhighsami

iTrader: (8)

Wouldn't the primaries be a large restriction? Didn't I read that they were like 1 1/2?

Packy

iTrader: (11)

I still have the Mac's...

Cmarsh

Macs modded with a 3 inch collector are a good header

kp

iTrader: (34)

Back in the day I switched from MACs (modded collectors) to FLP long tubes with a P1SC and gained absolutely nothing anywhere. Granted it wasnt huge power and had a stock engine but it was still a 10 second car.

The MACs are pretty decent headers for an FI car really until you start getting into bigger power/RPM.

Spade

iTrader: (26)

I am going to switch mine out here soon but I did put down 500rwhp/490rwtq on EPP's dyno with my MAC/Ory stuff. That was with a D1SC at 6.5psi. I am going to a 6.0l and pushing more boost, that is the reason for the change.

EPP

iTrader: (22)

Here is the 346 cid Corvette with the shorty headers with a D-1SC at 16 psi, this is also going through the factory cats. It made 740 rwhp. Bob
http://www.exoticperformanceplus.com...Car.php?car=40

venom ws7

iTrader: (13)

WOW awesome numbers with shorty and factory cats great work Bob.

and thanks again.

EPP

iTrader: (22)

Thanks, we're getting ready to build a new engine for this Corvette. That little 346 has been driven on a 2.5 mile road course twice a week for two hour sessions for quite some time, and the rings are getting worn. We're building a new engine starting with an LS2 block, then we're going to swap the D-1SC for an F-1A blower. We're going to keep it in the same boost range, the owner even wants to stay with the same Patriot LQ9 stage 2 heads. Basically looking for around the same power level without breaking the bank, as that is what we are doing with the track car we are involved with for him, shown here.
http://www.exoticperformanceplus.com...Car.php?car=50 Bob

ChevyChad

iTrader: (50)

I have Mac headers and like them. I made 632 rwhp on my old setup with a P1SC, so I think you are good to make 550 with a D1 thru Macs

Hennytime

iTrader: (33)

there was thread a while ago where a guy went from mac mids unmodded to qtp's and gained about 7rwhp in the mid and only peaked 2rwhp more....well spent 1200imo haha

BlackNiteWS6

iTrader: (2)

Thanks KP and ChevyChad...Looks like i can't go wrong with the Mac's and off road y-pipe.I'll take a dremel to the primaries to open them up alittle. Plus i can use
the money that i'll save going to the Mac's over the LT's for upgraded parts.
I know i could make more with LT's but i'm not shooting for that most power
i can make. I'm just shooting for something around 530rwhp to 550rwhp
since i'm still running stock bottom end.

BlackNiteWS6

iTrader: (2)

Now my next descision...a cam. I like the TR Blower cam, or MTI's Stealth cams,
and even the SC1 from Speed, Inc. looks promising. Want a good cam that will
go with the GTP 6.0 heads. I think the intake runners are 215cfm or 220cfm...
i've had them awhile and i don't remember their size

ChevyChad

iTrader: (50)

I like the SC2 cam 224/232 .581/.595 114. Not huge, but should get you in the power range you are looking for.

BlackNiteWS6

iTrader: (2)

From using the search button there's lots of guys making great power
with the GT2-3 cam, or the GT7 cam, and the TR Blower cam. I ran
a small cam in my T/A and i loved the torque it made. Just for ease of
tuning i'm looking at either one of the Lingenfelter cams or TR's cam.
The SC2 looks like a ordinary N/A cam. The other choices i listed seem
built more for FI.

Spade

iTrader: (26)

I am running the GT2-3 cam and I am happy with it. I have tossed around the idea of putting something bigger in but just can not do it. I love the driveablity I have now with the "smaller" FI cam. I plan on putting this cam in my new 6.0L engine and see how much HP I can make.