How Restrictive are the stock Mufflers? This much.....
Did a little work to the car this past week.
a) Strapped it to a local dyno for baseline then again after the work.
b) Kid there had the "brilliant idea" of pulling off the mufflers to get another dyno run comparison point
c) Holy cow - the stock mufflers are massively restrictive!
2009 G8 GT
628.5 RWHP on gasoline ---> ARH Long Tubes 1 7/8" & full exhaust / Magnaflow Mid Muffler / Cherry Bomb Vortex Mufflers / Magnuson 1.9 / Overdrive "non-cog" pulley system / Ported blower base / 2.70" Pulley / LS3 rockers with Trunion upgrade / Trick Flow x255 cylinder heads / 8-Rib Pulley system / Innovator West 10% Balancer / DOD Delete / Lunati Lifters / Custom CTS-V Patrick G Cam Grind / Wiseco Forged Rods & Pistons / Injector Dynamics 85lbs / 4.25" Air Intake Tube / 102mm TB & MAF Tube / 102mm TPIS Throttle Body / LS7 MAF Card / ZL1 Fuel Pump / JMS Fuel Pump Booster / VaporWorx Controller / B&M Tranny Cooler with fan / Circle-D Heavy Duty Rebuild & 265mm triple Disc Billet Converter / Camaro Tranny Pan/ Eibach Lowering Springs / BMR Front & Rear Sway Bars, LCA's, Control Arms / DBA 4000xs Rotors / Hawks Ceramic Pads
WOW, Looks like you need to get some after market mufflers there Henry!!!!
2009 G8 GT MGM.
Performance - 1900 MagnaCharger , Lunati Cam, RCR Ported Heads, Intake and TB, FAST #65 Injectors, CTS-v fuel pump, Kooks 1 3/4" LT and Catted X-Pipe, Pypes Violator Axel-Back, VCM OTR, RX Oil Catch Can, Pedders XA's & Track II Bushings, BMR Sub Frame Connectors, Sway Bars & Rear Control Arms, 19 Inch Staggered (8.5 front/9.5 Rear) VMR 810 Wheels, DBA 4000 Sloted Rotors with Hawk HPS Pads & Russels Brake Lines, Camaro 3.27 Diff, Gforce Axles.
Cosmetic - Partially De-badged Rear, 6.0L Badges, Tinted Side, Rear Markers & Tail Lights, 35% Tint, Auto-dim Mirror, Spencers 6K 35W & 5K 25W Fog HIDS, Blacked Out Door Chrome, Vagas Nates 3 Gauge Pod W/Interceptor Gauges, Color Matched GXP Diffuser, Shark Fin Antenna, V-LEDs on Side/Rear Markers, Brakes & Back Ups Lights, MM Carbon Fiber Rear Spoiler
1/4 mile 10.917 at 130.44mph 564 RWHP 568 Torque.
Holy sheeeet!!! Guess they become way more restrictive at your horsepower level. For us with the mild builds, probably not as much to be concerned with, but damn that made a big difference. Thanks for sharing this info...
Marty
G8 gone, but not forgotten...
It sure as hell got my attention! :-). I'm going the Magnaflow mid muffler and Cherry Bomb Vortex route. I was "floored" at leaving 49 ft lbs of torque on the table - and in my sweet spot of daily driving rpm! Yikes Batman!
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2009 G8 GT
628.5 RWHP on gasoline ---> ARH Long Tubes 1 7/8" & full exhaust / Magnaflow Mid Muffler / Cherry Bomb Vortex Mufflers / Magnuson 1.9 / Overdrive "non-cog" pulley system / Ported blower base / 2.70" Pulley / LS3 rockers with Trunion upgrade / Trick Flow x255 cylinder heads / 8-Rib Pulley system / Innovator West 10% Balancer / DOD Delete / Lunati Lifters / Custom CTS-V Patrick G Cam Grind / Wiseco Forged Rods & Pistons / Injector Dynamics 85lbs / 4.25" Air Intake Tube / 102mm TB & MAF Tube / 102mm TPIS Throttle Body / LS7 MAF Card / ZL1 Fuel Pump / JMS Fuel Pump Booster / VaporWorx Controller / B&M Tranny Cooler with fan / Circle-D Heavy Duty Rebuild & 265mm triple Disc Billet Converter / Camaro Tranny Pan/ Eibach Lowering Springs / BMR Front & Rear Sway Bars, LCA's, Control Arms / DBA 4000xs Rotors / Hawks Ceramic Pads
Never would have thunk it would be that bad.
Rotohack 102 intake - 102 MAF - TPIS 102 TB - TVS1900 ported & plated w 8 rib 2.5" front + OD rear
PnP Interchiller - RCR ported heads - RCR Lunati 219/231 113+1 - Forged Bottom End
ARH 2" LT headers - Solo 3" CB - MT DRs + M&H FRs on Weld RT-S
CTS-V fuel w Vaporworx - FAST 85s - Alkycontrol meth M15 + M10 - RCR tune
9.75@139.2 ? rwhp ? rwtq
From PatG back in 2010
9.5 RPM (Red Passion Metallic)
Sport /Premium
"If the women don't find you handsome, they should at least find you handy"-Red Green
Suprised you still have stock muffs.... but yea thats alot!!1
I dont think people have a clue on how much power can be killed with undersized exhaust.....
I just recently put on 3" muffs instead of the 2.5" mufflers I had... (had a full three inch system going down to 2.5" muffs...)... ARH and other shops said it wouldnt make much of a difference..........
After I did it, I went from 835rwhp to 921 rhwp...... i was absolutely shocked!!!!!!!
2009 G8 GT; F1x procharger on Supercharger store direct drive system; 430cuin LSX; E85; 9" rear; DSS once pc driveshaft; 4L80
9.2@151.... fastest and heaviest G8 known to man.......
you really drive your car with the gas pedal FLOORED between 2700 and 4200rpm ?Originally Posted by hflores3
you would only be using that range floor at the track , not on the street in normal average conditions
..when he accelerates from a stop light he will have more power......
Last edited by gr8lover; 03-15-2015 at 12:51 AM.
2009 G8 GT; F1x procharger on Supercharger store direct drive system; 430cuin LSX; E85; 9" rear; DSS once pc driveshaft; 4L80
9.2@151.... fastest and heaviest G8 known to man....
well since when have you ever seen anyone on a dyno , test in your average daily driving use ?..when he accelerates from a stop light he will have more power......
ive seen it done , NOT NEVER EVER !!!!!!
so in the real world , all the dyno is showing he will loose time(ie slower) at the track , so it shows nothing on how the car is driven in light throttle use
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