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Old 12-05-2014, 06:05 PM   #1
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Smile Borla vs Kooks

Alright guys, I'm new to this but here's my question: I've had a borla atak catback on my 2012 5.0 for a while now and want to take it up a notch with a pair of ballsy headers. I'm considering if to get the borla LTs or kooks LTs with an H-pipe (for sound) since I can't use my current x-pipe. Don't know which would sound louder. Want a powerful sound at idle and cruising speeds but want to be able to hear my other baby talking as well (gf. )I would love to wake up my neighbors with a muscle car sound from the heavens. I may be asking Santa for too much. Anyone have or has heard a similar setup? Any suggestions?
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Old 12-05-2014, 06:27 PM   #2
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I have Kooks ab's with long tube headers and a catted x-pipe, they are rather quiet man. I'd say your Borlas will be much louder

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Old 12-05-2014, 06:51 PM   #3
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It's been said a few times around here that LTs on the 5.0 actually quiets the idle a little. It's also to my understanding that LTs will deepen your exhaust and the h-pipe should aid with that as well. H vs X volume (loudness) I've listened for but have had a hard time determining which has actually been noticeable louder. Non-catted mid-pipes are definitely much louder than catted.
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Old 12-05-2014, 11:05 PM   #4
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I also have the ATAK's and they are pretty loud already. I would think that if you went catless then that would really wake that ATAK system up. Ive been thinking about going catless but worry that it might be waaay to loud. Whats the HP gains removing cats? 10-15? might be woth it.
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Old 12-06-2014, 05:06 PM   #5
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If you're worried it'll be too loud than it most likely will. Power gains aren't very noticeable with o/r mid-pipe, it's mostly for sound or FI IMO.
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Old 12-06-2014, 06:05 PM   #6
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Power gains aren't very noticeable with o/r mid-pipe, it's mostly for sound or FI IMO.
Wrong. Ditching the cats makes a big difference. I gained 3/10 doing it before going with my longtubes.
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Old 12-06-2014, 07:07 PM   #7
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Wrong. Ditching the cats makes a big difference. I gained 3/10 doing it before going with my longtubes.
When you switched to longtubes did you go with catted x pipe? If so did you lose much hp by going with catted x pipe?
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Old 12-06-2014, 07:39 PM   #8
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When you switched to longtubes did you go with catted x pipe? If so did you lose much hp by going with catted x pipe?
I run an off road x-pipe with my longtubes.
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Old 12-06-2014, 10:03 PM   #9
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Ditching the factory cats makes a big difference. A good aftermarket high flow catted pipe will rob little to no power. However, as long as the cops don't bother you, I say just run OR. Today's motors run so clean they'll pass a sniffer with an OR pipe anyway most of the time. Not to mention most of the CO2 emissions from the US does not come from automobiles.
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Old 12-07-2014, 02:36 AM   #10
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Wrong. Ditching the cats makes a big difference. I gained 3/10 doing it before going with my longtubes.
Stating from my own personal experience. I haven't done any testing though besides ***-dyno.
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Old 12-07-2014, 07:36 AM   #11
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Today's motors run so clean they'll pass a sniffer with an OR pipe anyway most of the time.
lol right! I ran cat deletes on my car for about two days, it smelled like an old 80's F150 hell, even with the high flow catted x-pipe I run with long tubes, it still kinda stinks, and I run good quality fuel.......
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Old 12-07-2014, 09:59 AM   #12
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So do you lose any power going with hi flow catted x pipes instead of off road catless x pipe?
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Old 12-07-2014, 11:28 AM   #13
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So do you lose any power going with hi flow catted x pipes instead of off road catless x pipe?
my tuner told me about 10rwhp at most, probably less because the high flow cats are so tiny
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Old 12-07-2014, 02:42 PM   #14
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my tuner told me about 10rwhp at most, probably less because the high flow cats are so tiny
Until a real high HP mark you will lose 1-2whp with high flow cats over catless, that is it. Hell one of the GT500s I'm stalking in the for sale section of another forum is 560 to the wheels through a Dynatech catted H pipe just to illustrate.
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Old 12-07-2014, 04:05 PM   #15
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Should I go catted x or h pipe then? Will you see a difference in power between the x or h?
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Old 12-07-2014, 04:11 PM   #16
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Should I go catted x or h pipe then? Will you see a difference in power between the x or h?
x-pipe will make a tad more power, but then it can be raspy, which some dont like, h-pipe will be deeper sounding without the rasp
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Old 12-07-2014, 05:27 PM   #17
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No, power is the same, go with the one you think sounds better. X pipe is raspy/poppy, h pipe is deeper.
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Old 12-08-2014, 03:09 AM   #18
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I also have the ATAK's and they are pretty loud already. I would think that if you went catless then that would really wake that ATAK system up. Ive been thinking about going catless but worry that it might be waaay to loud. Whats the HP gains removing cats? 10-15? might be woth it.
I gotta say my current catback is pretty loud after I give if a rev. Pretty subdued at idle and below 2,000 RPM. Headers will for sure wake up the beast. Trying to decide here. Everyone seems to be gravitating towards kooks. I can't find many youtube vids with borla catbacks + borla headers, even if vids don't give their sound justice. Biggest question in mind: which would be louder or more aggressive? Will be going catless either way. I'm not worried about failing inspection or getting pulled over by cops who want to compliment my setup. Help me out bros!
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