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Old 01-20-2019, 04:36 PM   #1
skippa1
 
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Best bolt on for better exhaust volume?

Hi all,

I am based in New Zealand and access to parts is a bit of a mission. I have a 2014 2SS/RS that is virtually stock with an L99.
The OEM exhaust sucks, it doesn't sound like a v8 should unless you smash the throttle.
I have an axle back system, am I better to do headers, Cat back ?
What first....what gives me the best exhaust note gain?

I would love to do the lot but cant at the moment. Not too interested in HP gains as if I go down this track in the future I will look at doing a cam etc ($8500 to do that job here, just priced with tune etc)

Help please.....swap a stock exhaust for one of you poor Californian's that has to tone it down
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Old 01-20-2019, 04:46 PM   #2
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Cat delete if you can....best bang for free !!!
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Old 01-20-2019, 04:51 PM   #3
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Borla cat back exhaust (I went with the Type-S). Sounds amazing and no drone.
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Old 01-20-2019, 04:51 PM   #4
skippa1
 
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Cat delete if you can....best bang for free !!!
I assume the cats have an O2 sensor or similar. How do we do the delete?
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Old 01-21-2019, 06:00 AM   #5
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Yes JBA cat delete pipes and a SCT tuner to get rid of the CEL for no cats. Even with stock muffs it will sound much better.
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Old 01-21-2019, 06:27 AM   #6
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Get the 3 inch Corsa Xtreme and call it a day. Zero drone.
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Old 01-21-2019, 10:28 AM   #7
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Even switching to just high flow cats will make a big difference in sound.
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Old 01-21-2019, 05:37 PM   #8
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Best exhaust for the SS is catless downpipes, longtubes and stock resonators and stock mufflers.
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Old 01-21-2019, 06:22 PM   #9
skippa1
 
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I understand the whole system would be an easy mod, trouble is, getting a decent system then getting it to New Zealand will cost me $3-4k.
It looks lie I can do a resonator delete with cross pipe for about $300 incl shipping.
A question regarding cat delete though, how do you bypass the sensors?
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Old 01-21-2019, 06:28 PM   #10
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You tune the rear O2's out
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Old 01-21-2019, 06:51 PM   #11
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headers make a big difference, give it a performance sound and adds power.
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Old 01-21-2019, 06:54 PM   #12
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Assuming it's the same in NZ, the rear cats aren't monitored. These cars have 4 cats total. If you don't have to worry about emissions just get long tubes, but a cheap / easy / quick option is just removing the rear cats. And like you said before, if you get that big center resonator removed and add a regular X pipe or even an X muffler, you'll still pick up volume. Recommend getting an AFM delete device though because supposedly the L99 with an exhaust has some awful drone when in AFM.
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Old 01-21-2019, 08:29 PM   #13
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Cheap way is to get rid of that funky L99 resonator and replace with a resonated x pipe.
Proper way; get rid of that funky L99 resonator, headers and a tune.
So many wreck a prefectly good exhaust system with a cat back.....waste of money.
Good luck.
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Old 01-22-2019, 11:02 AM   #14
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Quote:
Originally Posted by skippa1 View Post
I understand the whole system would be an easy mod, trouble is, getting a decent system then getting it to New Zealand will cost me $3-4k.
It looks lie I can do a resonator delete with cross pipe for about $300 incl shipping.
A question regarding cat delete though, how do you bypass the sensors?
But you will not get much more sound from that.

What most people are saying is true. Deleting the cats will give you the biggest gains in volume. Either by way of catless downpipes or long tubes, both of which will sound great with the stock exhaust.
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