What Exhaust system is best? - Pontiac GTO Forum
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post #1 of 17 (permalink) Old 01-27-2012, 05:08 PM Thread Starter
 
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What Exhaust system is best?

Alright folks I need some opinions.... I have a 05 GTO...CNC Port and Polished heads...Comp Cam .619/.624...239...113LSA....Pacesetter LT Headers with Pacestter midpipes (No cats)...I still have the factory resonator and Flowmaster Mufflers...My last Dyno was 435/418. I want to get rid of the factory resonator and my motor guy makes fun of me for the Flowmasters..He says they are just way behind the times in performance. I am kinda leaning toward the SLP Loudmouth catback kit but have heard some say that Magnaflow is good. My car hits a good hard solid beat but I think I can get more RWHP from an engineered system instead of my local muffler shop weld on FM's...I have also read that taking out the resonator creates more "exhaust popping" shifting between gears....Any and all opinions appreciated.
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post #2 of 17 (permalink) Old 01-31-2012, 08:53 PM
 
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Not much is to gained swapping out catbacks on these cars. Save your money and spend it elsewhere.

<-- Guess which ones quicker?.....Nope! Not even close.
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post #3 of 17 (permalink) Old 02-01-2012, 07:46 AM
 
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If you want more HP... get Kooks headers. As much as they are it is a better investment then a catback. Aftermarket catbacks don't do much/if anything for HP. They just sound cool and probally weight less(atleast my JBA did).

2003 Corvette Z06 - MGW shifter, Corsa X pipe, Corsa Xtreme exhaust, Texas Speed long tubes w/o cats, PowerStop rotors/pads, Conti DWS tires, C6Z51 F&R sways, C5R headlights, tuned

04 GTO - sold
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post #4 of 17 (permalink) Old 02-01-2012, 10:25 AM
 
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If you want a new sound, get a catback. If you want performance, I'd make your next mod 3.91 gears.

Current: MGW-p, H-pipe, SS OTRCAI, Lovell rear springs, Eliminator shocks and Pioneer AVH-P3300BT, JBA LTs+catless mids, Drilled/Slotted rotors, Kooks Afterburners, catch can & Tune Next: ??? Wish list: Intake & TB, modest cam, UDP, gears
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post #5 of 17 (permalink) Old 02-02-2012, 10:23 PM
 
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Catbacks are more for acoustics than anything else (I have catback systems on each of my cars solely for acoustics). If you are looking for more flow you need to look further up at headers and high flow cats.
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post #6 of 17 (permalink) Old 02-03-2012, 09:23 AM
 
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A good aftermarket catback will net you around 5 HPish, at least that's what Borla claimed on dyno tests of my exhaust. It's the sound, the quality of stainless steel, the looks of the tips, and the weight reduction that you're after. I liked the 5" tips of the Borla and already knew what they sounded like on my buddy's '99 Lingenfelter Vette so I went with them. They are a little over 20 pounds lighter then the stock oil drums that come on the car.
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post #7 of 17 (permalink) Old 03-06-2012, 07:18 AM
 
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i think the magnaflow 3'' is the beast
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post #8 of 17 (permalink) Old 03-16-2012, 10:23 AM
 
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Corsa Sport catback , wont find a nicer exhaust
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post #9 of 17 (permalink) Old 03-16-2012, 11:01 AM
 
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Skip shift and Kooks Afterburners are the only two mods on my 05 M6. Acoustics were all I wanted and I have really enjoyed the sound and quality of the Afterburners. Can't count the number of compliments I've received from guys at parking lots, stop lights, garages, etc.
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post #10 of 17 (permalink) Old 03-16-2012, 02:05 PM
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Garage
Put on LTs and you get the same compliments and 25 RWHP

2004 Blk/Rd M6
6.3 litre LS1

Built and tuned by svede
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