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Bonneville GXP/ Northstar Powered Cars Discuss your Bonneville GXP and/or any other Northstar powered Olds or Cadillac... Including the 3.5L Twin Cam V6 (Short Star ) 4.0L and 4.6L Northstar V8's. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 09-12-2007, 06:44 PM   #1
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Default gxp exhaust

want to raplce the mufflers with a good sounding mufflers not to loud but not to quite anyone have any suggestions
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Old 09-12-2007, 09:49 PM   #2
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As long as you leave the resonator on, any dual muffler set will sound good without being stupid loud. Magnaflow sounds pretty great on my 4.0
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Old 09-12-2007, 11:25 PM   #3
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take a look at this muffler
http://www.holley.com/types/Aero%20Chamber.asp
here it is on my car (5th one back)
http://s90.photobucket.com/albums/k2...rent=flyby.flv
here is the Part #: 21513HKR that my car has for the mufflers.

ROD
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Old 09-14-2007, 02:10 PM   #4
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is there anything out there for a gxp
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Old 09-21-2007, 12:45 AM   #5
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There is nothing out there as a system for the Bonneville. You have to make your own. Our car is actually pretty easy. Just lob off the OEM mufflers right where they co into the mufflers then order some Magnaflow'*. The mufflers will slip onto the OEM plumbing. You'll then need to custom bend about a foot long piece about 60* to bring the tails straight out the back of the car (as our mufflers are mounted on an angle), then choose whatever tips you like.

I chose ones similar to these on each side;
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Old 09-21-2007, 03:03 PM   #6
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what series type and sixe mufflers
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Old 10-01-2007, 12:47 AM   #7
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Mufflers = 2 x #12225 5x8 mufflers
Tips = 2 x #35121 tips

Muffler


Tips
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Old 10-17-2007, 08:28 PM   #8
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CMNTMXR57,
You replaced the exhaust tips on your GXP? The new ones look great! I am a fan of the stock ones as well though. Would you want to sell me the stock tips off your old exhuast?
Grant
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