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      05-13-2017, 04:28 PM   #1
johnnydg
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Do i need a retune on ess supercharger w/ stock cats?

Hi all, I'm going to be taking off my AA x pipe w/ High flow cats. And putting a stock X pipe with OEM main cats back on and keeping the supercharger on the car. What will happen if i do this without getting an ESS re-tune for stock cats? I would eventually get a re-tune if i keep the stock X pipe on but i want to test it out, will the car have any issues or throw any codes?
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      05-13-2017, 11:51 PM   #2
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Probably nothing, but ESS will usually provide the tune you need for free
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      05-14-2017, 04:06 PM   #3
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What ess kit you have?
625 and 650's recommend HFC's. Might want to inquire about that. Lessor kits shouldn't make any difference in the tune.
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      05-14-2017, 04:15 PM   #4
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you dont have to change the tune, did the same thing on mine.
You will gain soem torque midrange and lose some power at high rpm
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      05-14-2017, 04:55 PM   #5
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Quote:
Originally Posted by johnnydg View Post
Hi all, I'm going to be taking off my AA x pipe w/ High flow cats. And putting a stock X pipe with OEM main cats back on and keeping the supercharger on the car. What will happen if i do this without getting an ESS re-tune for stock cats? I would eventually get a re-tune if i keep the stock X pipe on but i want to test it out, will the car have any issues or throw any codes?
I'm sure a tune with test pipes will need a revision , not sure about high flow cats , I've seen a couple of stock cats melt .
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      05-14-2017, 05:26 PM   #6
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If you are putting the stock xpipe and stock cats back on to pass smog (the obd testing) then you'll need a tune to get your emissions readiness to turn back on. (You'll still need a smog tech however to turn a blind eye to the supercharger under the hood)
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      05-14-2017, 06:43 PM   #7
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thanks for the replies,

not worried about emissions/state inspection. doing it to see if it will resolve a exhaust vibration. I have an ESS595 kit. So I won't need to worry about anything or even get a retune for stock cats?
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      05-14-2017, 07:51 PM   #8
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Quote:
Originally Posted by johnnydg View Post
thanks for the replies,

not worried about emissions/state inspection. doing it to see if it will resolve a exhaust vibration. I have an ESS595 kit. So I won't need to worry about anything or even get a retune for stock cats?
You will be fine but big loss in power!
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      05-15-2017, 10:23 AM   #9
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How much power loss will happen just from adding back the cats? I have a ESS 595 kit with eisenmann race exhaust.
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      05-15-2017, 04:25 PM   #10
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Running stock cats on a supercharged S65 is pretty bad... You lose a lot of power, which pretty much defeats the purpose of getting a Supercharger. If anything, use high flow cats!
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      05-15-2017, 04:27 PM   #11
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Originally Posted by gordon@ View Post
Running stock cats on a supercharged S65 is pretty bad... You lose a lot of power, which pretty much defeats the purpose of getting a Supercharger. If anything, use high flow cats!
I'm assuming you lose 25-30HP by running stock cats. I really like my exhaust and it can't be ran with HFC's (I tried and it's unbearable). Not to mention I have emissions testing every year so swapping them out would be a pain. The car is insanely faster than when I was stock =).
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      05-15-2017, 04:57 PM   #12
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Quote:
Originally Posted by BrewRifle View Post
I'm assuming you lose 25-30HP by running stock cats. I really like my exhaust and it can't be ran with HFC's (I tried and it's unbearable). Not to mention I have emissions testing every year so swapping them out would be a pain. The car is insanely faster than when I was stock =).
Very true, over here in Canada emissions are done via OBD. I thought most tuners had a fix that could pass that?
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      05-15-2017, 05:45 PM   #13
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Quote:
Originally Posted by BrewRifle View Post
I'm assuming you lose 25-30HP by running stock cats. I really like my exhaust and it can't be ran with HFC's (I tried and it's unbearable). Not to mention I have emissions testing every year so swapping them out would be a pain. The car is insanely faster than when I was stock =).
What exhaust setup are you currently running? And why couldn't you handle HFC's?
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      05-15-2017, 05:58 PM   #14
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Quote:
Originally Posted by johnnydg View Post
What exhaust setup are you currently running? And why couldn't you handle HFC's?
Titanium Meisterschaft GT2 with stock cats. I ran the AA HFC X-Pipe and it was stupid loud and sounded like shit at WOT.

Listen to these -

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