Which headers for Magnaflow catback?
Hey all
New here, and new to the G8 world
Just picked a GT and discovered it has a magnaflow catback exhaust on it.
I’d like to put headers on the as well and was curious is anyone is running a magnaflow cat back and what headers are you using.
Thank you so much for your time
You're going to look for headers that would work with the stock catback... I don't know that any will without some work.Originally Posted by SinisterGT
2009 PBM G8 GT
Pat G 218/226 & TSP Dual 660s, ARP Bits, DSteck Tuned, Magnacharger Chrome 2300 1:1, RCR Ported/Polished TB, Blower, & L92 Heads w/ LS3 intake valves, Smith Brothers Trunion Bushing Kit, ARH 1 7/8 Magnaflow MidMuff/Solo Axlebacks, RotoFab, VaporWorx PWM 1:1 fuel system, ID1050x injectors
Mike Norris Motorsports Catchcan, AEM 30-4100, JHP Boost/Fuel Gauge Pod
TSW Nurburgring Matte Gray 18" w/Nitto 555 & 555R, Satin Black SS Brembo Fronts, BMR Trailing Arms, Pedders Sway Bars, Whiteline Bushings
Gloss Black Valve Covers, 6k HID, V6 Handles, Interior/License Plate LEDs, Debadged, Holden Black Trim, Polk Dxi, GXP diffusor, a few bits from Crazy Paul
RIP Charlie - GRRRR8Originally Posted by TonyKarter
Anyone who has ever worked on a car has been in your position, and sitting cross-legged on a concrete floor with a dim shop light is its own kind of hell... Chalk it up as one of the rites of passage.
RIP Chris Wells - Panzer Leader
Kooks with the correct adaptors will work. I will warn you, that exhaust will drone you right out of the cabin with headers!
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!
Kooks Mid Length headers with cats (Kooks #24201420) will work with a cat back system. I have them and the Magnaflow 16887.
What Chewy says is right, if you still have the cylinder deactivation active (a.k.a. DOD) the Magnaflows drone bad, especially on the highway. Once that was removed the sound is pretty nice, a little on the low side for some.
2009.1 PBM GT
Performance: Baker Engineering Wrenched and Tuned, BMR, Roto-Fab, Magnaflow, Hankook, DBA, Hawk. Kooks, ATI
Current Numbers: 399 RWHP, 377 RWTQ
For Show: Crazy Paul parts, RedlineGoods Holden rear armrest, Maverick Man, Lockwood SS V8 gauge face, VG Shark Fin, Black Cat Custom Triple Gauge Faces, CTS-V's
I have magnaflow cat back with kooks mid length headers which come with HFC's that will bolt right up to the cat back system. Tune will likely be needed for the high flow cats so they don't throw a code. Headers aren't going to change the sound much, speaking from experience.
I think pypes or ARH or somebody makes long tube headers that will bolt up. If something says it will bolt up to the stock cat-back, it will work since your magnaflow cat back should have the same connections as stock.
I do agree that DOD should be turned off considering the almost negligible mileage gain and drone this system makes.
09 GT PBM - Red/Onyx - Sport, Premium, Roof
Rotofab, LS7 MAF, Pat G, Kooks 1-7/8 Mids w/ HFC's, Magaflow Cat-Back, 3.45 gears
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