This is all great info. Thanks for the HP increase link too I will read it.
I had mid length MAC headers on my FireHawk with an LS6 manifold (standard) and a manual cut-out that cost a whopping 50 bucks. The exhaust was 3 inches but by passed when the cut-out was open because I was running a 150 shot. It was a NOS 5177 kit with an MTI clear lid and it went to a descreened MAF with Thunder Racing ported MAF Ends. I also had a Hyperteh 160 thermostat and a Hypertech Power Programmer.
I bracket race thus the A4 choice plus I commute for a living at times in heavy Bay Area traffic. The 6.0 liter is a great thing but I hate the looking back and I should of waited routine.
Truth is I got a $3500.00 rebate **AND** 2.9 percent finacing on a 5 year loan and they only had 2 GTO's in stock, black and yellow. Ever drive a car and say, "I must have this?" Well I loved it and I plan to make it fast. I will probably do the exhaust, some cams and internal N/A stuff. I'm not sold on after market headers for these LS1/LS6's in California unless they are equal lenth long tubes. Anything else is a waste of money to me and I have done this path many times. I am in no hurry though and I am forced to use a dial up while at work so it is slow reading for me. I will be lurking though and when I get home to my broadband I will be following others mods closely. I saw the exhaust pic in the link that was posted in this thread and it was SWEET! I also saw the Pro Charger box in the background hehe. If you check cardomain and search for the user sactownbooster (that's me) I have plenty of pics of my 9-10 pounds of boost on my Nissan 350Z I just sold. That car was a tuning nightmare but I ran consistant 12.2's and 12.3's after taking it to Technosquare and Edge racing and adding a 3000 stall torque converter and having it road tuned at the ECU level. The 350Z's were blowing engines left and right though because of timing. We had about 10 members lose their $6500.00 engines by jumping into FI w/o studying and I remember why I stuck with F-Bods hehe
. Anyways I think the exhaust has lots of bottle necks from what I have seen. Anyone have a sound clips of one of these after market setups that I can hear? Is there a way to get rid of any resonators without messing with the 4 02 sims? It looks like the thing has 4 cats and 2 mufflers? aRE THE 4 02 simms needed or can you just run the 2 after the main cats post headers and pre cat and delete the other 2 and do a cat back?
Anyways, thanks for the warm welcome, I am glad to have found this site so I can learn. I have been on LS1.com since 1999 but that site has just gotten too big. I have lots of pics of my SS and FireHawk there over the years.
When I get home I will post some more. Here is a couple of pics though plus I will take some of my GTO and show the progression as that as my car grows and gets faster. I just hot 1400 miles. Take care!
http://home.surewest.net/mailmax/pictures%202.htm
Time to update my page with some GTP pics!!!
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