DECAT exhaust without a TUNE. Is it safe? - Rennlist Discussion Forums



DECAT exhaust without a TUNE. Is it safe?

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Old 03-16-2017, 02:20 PM   #1
Ruskiy
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Default DECAT exhaust without a TUNE. Is it safe?

A few questions about running a DECAT exhaust (KLINE?):

1) Has anyone actually DYNOd their 997TT and confirmed claimed 40HP/TQ gains without a tune?
2) Are these gains possible with 2.5” piping? To keep the drone and noise at bay.
3) Is the OEM ECU capable of adjusting all of the necessary values and maintain OEM/Stock like reliability?
4) I assume that the O2 sensor extenders will eliminate the Check Engine Light (CEL)?

My goal is to gain slight power safely and improve the sound without messing with the ECU.

Last edited by Ruskiy; 03-16-2017 at 03:26 PM.
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Old 03-16-2017, 03:05 PM   #2
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1. Not sure, but I wouldn't be surprised, the stock exhaust is heavy and restrictive.
2. Yes, you don't need 3" piping for the factory turbos.
3. Yes, though you will throw a check engine light for catalyst inefficiency codes.
4. You mean 02 extenders that back the secondary 02s back out of the exhaust flow slightly? That works on some cars, I haven't seen it tried here. OBD2 scanners that stay in place may possibly work, but they just constantly reset the ECU and readiness codes are never set. A flash is the best way to deal with that but that isn't consistent with your goal.
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Old 03-16-2017, 03:28 PM   #3
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Sorry, that is correct. I am trying to use O2 extenders to eliminate the CEL issue and the need for a flash/tune.
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Old 03-16-2017, 03:36 PM   #4
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A4 hit all points Ruskiy! Let me know if you need anything.
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Old 03-16-2017, 04:01 PM   #5
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You're my go to guy, Sambo . As you can tell I am trying to kill two birds with one stone here.
A. Not messing with ECU
B. Power gain, nice sound and no drone

As soon as I'm ready, will be sending you a PM. I also seen some folks complaining about power loss on KLINE exhaust as oppose to Europipe/FVD etc... So I'll need to look into that. But I think that's only on versions with a CAT.
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Old 03-16-2017, 04:10 PM   #6
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I can guarantee that is not true. Been beaten to death but I will 100% be there for those who claim to be experiencing it. It's a little too convenient of a claim in certain cases. #exhaustwars lol

But we will never take that stand. Just provide top notch service and guarantee the product. I have yet to have an actual unhappy client. Not to mention we have the fastest VTG cars in the states and some overseas running Kline! Lines are always open ; )
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Old 03-16-2017, 05:45 PM   #7
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I would go Kline over EP every time. That bit about power loss over time with one exhaust over the other is pure BS. Don't fall for the FUD.
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Old 03-16-2017, 06:19 PM   #8
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I have the Kline 3" on mine with no cats, its tunned, but no drone at all and its honestly not that loud, I absolutely love the sound of it ! Amazing system and also from Sam ! Top notch service !
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Old 03-16-2017, 06:57 PM   #9
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Kline from Sam is the way to go. You may get a cell even with the extenders but you can try packing them with steel wool. That's what I do to pass inspection.
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Old 03-16-2017, 06:57 PM   #10
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Quote:
Originally Posted by A418t81 View Post
I would go Kline over EP every time. That bit about power loss over time with one exhaust over the other is pure BS. Don't fall for the FUD.
Why would you choose Kline over Europipe every time? Please elaborate if you wouldn't mind...
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Old 03-16-2017, 10:57 PM   #11
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It's like arguing over sports teams. Exhaust sound is subjective, build quality can vary but both EP and Kline are high quality. What people are failing to mention is that the stock ecu will adjust for a new exhaust and gains will be minimal. The only way to truly benefit from a free flowing aftermarket exhaust is with a tune.
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Old 03-17-2017, 12:13 AM   #12
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Sorry for sparking this exhaust debate.

Type and make aside, DECAT, power gain and no tune/no CEL is what I care about.

Thanks all!
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Old 03-17-2017, 12:58 AM   #13
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Quote:
Originally Posted by Ruskiy View Post
Sorry for sparking this exhaust debate.

Type and make aside, DECAT, power gain and no tune/no CEL is what I care about.

Thanks all!
I have similar goals (I may want to go DECAT and do no tune / no CEL.)
Have you found a decat solution that'll result in no CEL and no harm to the engine? What brand are you going with?
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Old 03-17-2017, 06:55 AM   #14
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bondjockey brought up a good point. I believe it's been mentioned quite a few times in the past that an exhaust only w/o Tune will net minimal gains once the ECU adjusts to it. I believe the ECU minimizes the gains once the TQ values are met per factory programming.

Quote:
Originally Posted by bondjockey
It's like arguing over sports teams. Exhaust sound is subjective, build quality can vary but both EP and Kline are high quality. What people are failing to mention is that the stock ecu will adjust for a new exhaust and gains will be minimal. The only way to truly benefit from a free flowing aftermarket exhaust is with a tune.
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Old 03-17-2017, 08:06 AM   #15
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Oh wow. I didn't know the ECU "detunes" itself.

I recall folks saying the complete opposite too, that after the exhaust install, you'd take the car for a spin and each full throttle pull the ECU learns that the exhaust is more free flowing and will keep getting more powerful until it dials in the values.

Could someone debunk this for us?
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