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Old 02-24-2014, 03:36 PM   #1
ShawDizzle
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Wasn't sure how to title it but my exhaust which I repaired and welded after damaging it is leaking and causing problems. Just the cat back is problematic. Time to swap it. If I purchase another cat back brand but of similar size, will a tune be required? I'm keeping the turbo XS downpipe on there which was undamaged. I'm upgrading turbos soon but I need to fix the exhaust ASAP

Car was protuned with 16 psi with boost controller, BOV, CAI and this turbo back. All of which are still on and staying on except the catback of course
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Old 02-24-2014, 03:41 PM   #2
currymaciel
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I dont believe it is required, especially if youre staying with the same diameter tubing.
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Old 02-24-2014, 03:43 PM   #3
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No. No tune is required.
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Old 02-24-2014, 04:26 PM   #4
jr420
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No, but you're a lot better off with a tune.
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Old 02-24-2014, 04:31 PM   #5
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Quote:
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No, but you're a lot better off with a tune.
Lol on a cat back? Or you just saying he's better off with a tune in general?
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Old 02-24-2014, 04:39 PM   #6
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Lol on a cat back? Or you just saying he's better off with a tune in general?
In general but keeping in mind catbacks flow at different rates and have different design concepts and affect different areas of the power band - so if you have a tune in the first place with your mods you probably want a retune with a different exhaust system. For example if you're running a twin-chamber 76mm cat-back and switching to a grape-fruit shooter then there will be differences. If you're switching grape-fruit shooter to grape-fruit shooter then you'll be fine
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Old 02-24-2014, 04:59 PM   #7
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I don't plan on deviating much from the current set up for two reason. Was just one reason because I'm happy with it, now it's two reasons because I don't want a tune now, then another in 6 months after I pop on a turbo
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Old 02-24-2014, 05:01 PM   #8
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I may actually just replace these flanges again then just buy a whole new system with new turbo. Who the hell knows. Just need options
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Old 02-24-2014, 09:44 PM   #9
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Catbacks do not require tunes. As stated by the Manifesto, Tuners, AND if you used 2 seconds to search for your answer.
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Old 02-24-2014, 10:40 PM   #10
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Catbacks do not require tunes. As stated by the Manifesto, Tuners, AND if you used 2 seconds to search for your answer.
The great hinshaw. I looked for a little over 2 seconds but it says nothing about swapping aftermarket Catbacks on a protune.

I was being safe and was afraid that if I "blow up my car" like you always say, I didn't want to be ridiculed for that in a future post god forbid that happened.

The manifesto is great but doesn't answer everything. Don't have to spit this classic quote of yours to me.
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Old 02-25-2014, 12:07 AM   #11
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I swapped from the q300 to the greddy evo 3 and finally the cobb after I was protuned for the q300. Did some logging and have an afr/egt gauge and everything was still fine. Just got retuned for the cobb just in case.
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Old 02-25-2014, 09:36 AM   #12
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Quote:
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I swapped from the q300 to the greddy evo 3 and finally the cobb after I was protuned for the q300. Did some logging and have an afr/egt gauge and everything was still fine. Just got retuned for the cobb just in case.
Sounds like it doesn't matter then in most cases. I've decided to replace the gaskets for now then just change the entire system once in ready for turbo and tune. Thanks for your input though.
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Old 02-25-2014, 10:21 AM   #13
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Cat backs don't matter in any case.
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Old 02-25-2014, 03:55 PM   #14
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Quote:
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Cat backs don't matter in any case.
Ya, I wasn't totally sure so is played it safe

I knew I'd draw your attention. Ha.

Replaced the gaskets. The idiots who did the first repair put a paper gasket at the downpipe/turbo connection. I have no clue why. Pure laziness. I have my sound, power, throttle response and MPG back which were all attributed to the leaks
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