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Exhaust performance gains

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MeangreenST

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I’m thinking of putting an exhaust on my ST. I’m just wondering if put it on a Borla cat back or any other recommended exhaust will give me any power gains or just change the sound of the exhaust. Also, was thinking about possibly doing a downpipe with the 93 octane Tune. Anybody have any experience with either Of these options or know what the power gains would be?
 

UNBROKEN

UNBROKEN

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Borla isn’t much better than just doing a muffler swap...the piping is the same 2.25” diameter as stock and it keeps the stock mid pipe. Expect no power gains.
Corsa is incrementally better at 2.5” but still keeps the stock 2.25” mid pipe. Expect better sound than Borla IMHO but still no power.
Magnaflow and Thermal R&D are actually 2.6” from the downpipes back and could actually make a few HP if you have the other pieces of the puzzle in place. Magnaflow is known to drone really bad though.
 

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TheGovernment

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The actual HP gains will be next to nothing on all of them. Until you start maxing out the size of the current exhaust, you are doing it for future upgrades and noise.
 

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MeangreenST

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UNBROKEN said:
Borla isn’t much better than just doing a muffler swap...the piping is the same 2.25” diameter as stock and it keeps the stock mid pipe. Expect no power gains.
Corsa is incrementally better at 2.5” but still keeps the stock 2.25” mid pipe. Expect better sound than Borla IMHO but still no power.
Magnaflow and Thermal R&D are actually 2.6” from the downpipes back and could actually make a few HP if you have the other pieces of the puzzle in place. Magnaflow is known to drone really bad though.
Click to expand...
Any knowledge on downpipe gains? I know the labor is extensive but if the gains are decent with the 93 octane tune I’d do it. If the exhaust is just noise I have a SS Sedan with a full exhaust if I want to make noise. Thanks for your input you seem pretty knowledgeable on the ST’s
 

UNBROKEN

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I don’t know that anyone has done a before and after Dyno with just DP’s...I missed it if so. I picked up right at 2/10’s with SPD DP’s and full 3” exhaust on 93. 3” is absolutely overkill...but I knew I could get a good deep tone with the larger piping.
 

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MeangreenST

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UNBROKEN said:
I don’t know that anyone has done a before and after Dyno with just DP’s...I missed it if so. I picked up right at 2/10’s with SPD DP’s and full 3” exhaust on 93. 3” is absolutely overkill...but I knew I could get a good deep tone with the larger piping.
Click to expand...

Cool. Did you do a custom 3” exhaust? Have yo done any sound clips?
 

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Novagunner

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how much more work is swapping turbos if you are already going to do down pipes? Is there much overlap in labor?
 

5LTR550

5LTR550

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What stand alone muffler would you all recommend ?
 

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