4 Gasem; I sure know what you mean and that is really the main reason I'm q&a'ing with a header replacement system. I do know that MagnFlow will have their high flow cats that do fit the stock header and bolt up with the rest of the stock system in about 2-3 weeks, according to the guy I talked to at MagnaFlow.
Ahh... Good to know! I see they had a part number! I will go with theirs then.Originally Posted by jbradsh1
Hope it's not more than expected for them though.
2009.5 MSM GXP 500ish N/A RWHP. Mods include but aren't limited to: Texas Speed 418 (6.8L) fully forged held together with ARP from top to bottom, PRC 255cc heads, Rick Crawford intake plenum, TB port, polish and tune, Roto-Fab 102mm CAI w/LS7 MAF, Kooks 1-7/8" headers wrapped with DEI, Corsa catless system, Circle D 3200 Stall, 3.45 final drive, BMR's complete street bushing kit and sway bars, Eibach Pro Kit, G-Force Axles, running on staggered VMR 710's with Bridgestone RE11 rubber. HSV triple gauge pack with Calais smokers kit mod, V6 tails, debadge/rebadge, V6 door handles, AU black door trim, Maverick Man under hood strut covers, & washer and bolt kit, fully corrected paint thanks to Adams Polishes and my hard work. Built with reliability in mind with some power for those times when you need to pass or go over a big hill. Just a poser, not a racer!
4Gasem; yea, H-2 were widow makers if you didn't have a golden angle sitting off your shoulder. God did they high speed wobble half way leaned over. You could fix it a little but compared to newer bikes they were a joke in the handling dept. Never ever got beat on the street though back then, by anything that had wheels on it.
4Gasem; I'm inclined to go the same way. Just get high flow cats. We'll see what develops.
If you are going to get headers & don't want a ton of sound definitely get either Kooks or American Racing Long Tubes, High Flow cats, & keep your stock axle back system.
George in PA did this & he is happy. I will have this set up with Kooks LT's when my car gets out of Vector's Shop!
...
2009 White Hot G8 GT (stock)
* SOLD * 222/230 .597/.600 114+4 EPS Cam, Patrick G ECM/TCM Tune, Roto-Fab CAI, HSRK, Yank 3200 Torque Converter,
Transmission Cooler, Kooks 1 3/4" LT Headers, high flow cats, stock mufflers, Billet Prototypes Catch Can, UD Pulley,
Ported Intake Manifold, Spohn Trailing Arms
407 RWHP & 365 RWTQ
Best Time: 12.517 @ 115.02mph w/ 1.97 60' time - (on stock 18" AS Tires)
I've been following your posts and since you seem to be on the same path to performance improvements I'd really be interested in what kind of gain you realize, especially 1/4 mile time & speed. Let me know, would ya?
A lot of times it's the header flange thickness that makes the difference. For instance, both Hooker and Flowtech make LT headers for the 2000 LS1 F-body. Both companies are owned by Holley. And, both of the headers are the EXACT SAME design. However, the Hookers cost $894 whlie the flowtech costs $419.
Why the difference if the bends, collectors, etc are all the same? Well, the Hookers use a much thicker flange, and also thicker tubing. Their welds are also more consistent.
So for our G8's, what's your opinion as to the best built and best performing LT header, and why?
Obviously the ones we bought!
2008 Liquid Red, Premium (onyx/red), Sport. ARH 1 3/4 LT, Roto Fab CAI, VMS HSRK, Jeremy Formato Ported Intake and TB, Livernois Stage 1c Cam & DOD Delete, CNC Valve Job, Jeremy Formato Chasis Dyno Tune, BP Catch Can, lower panel mod.
jeff, you really need to decide if your biggest want is performance or quiet. You can't have max performance at stock noise levels (i.e. none).
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