Stock exhaust modification. Cat Delete. - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

NickFRS · 10-18-2013, 09:51 PM

Has anyone simply deleted the cats out of their Header and Front pipe? Couldn't really find anything on this.

NickFRS · 10-22-2013, 09:00 PM

No one??? This really surprises me! I'm highly interested to see if it makes an improvement in power.

JW89225 · 01-17-2014, 01:27 AM

^Hello OP, I removed the secondary catalytic converter on the front pipe. I retained the small muffler on the front pipe. Sound wise it is pretty much as quiet as stock, but there is a better response or perhaps a slight gain in power around 2500-3000rpm. Everything else is stock, 6AT

Cheers!

FRSoxfan · 01-17-2014, 10:24 AM

OP, I deleted all the cats and installed Borla UEL headers. Kept the stock muffler setup though. Used the Borla overpipe/frontpipe cat delete combo pipe. Let me know if you have any questions!
[ame="http://www.youtube.com/watch?v=XYwKFBJjn6A"]IMG 0785 - YouTube[/ame]
[ame="http://www.youtube.com/watch?v=2cDD7UpPdrE"]IMG 0784 - YouTube[/ame]

MAPerformance · 01-17-2014, 11:23 AM

Perrin did this a while back, but did not notice any real performance gains on the dyno. I will have to try to dig up his blog post on that.

FRSoxfan · 01-17-2014, 12:27 PM

I'll agree to that, the ol' butt dyno tells me there is def a little more torque in the lower end, got rid of the dip a little. Nothing drastic though, obiviously.

tennisfreak · 01-17-2014, 04:04 PM

nelsmar deleted cats off his stock pipes and found with tune it got the same hp as his revworks header and nameless front pipe combo.

http://www.ft86club.com/forums/showthread.php?t=55770

NickFRS · 01-17-2014, 05:36 PM

O god someone resurrected this? Looks at the other topics.

10-18-2013, 09:51 PM	#1
NickFRS Senior Member Join Date: Jun 2012 Drives: 2013 Asphalt FRS Location: Gladstone Posts: 1,450 Thanks: 899 Thanked 440 Times in 286 Posts Mentioned: 75 Post(s) Tagged: 0 Thread(s)	Stock exhaust modification. Cat Delete. Has anyone simply deleted the cats out of their Header and Front pipe? Couldn't really find anything on this. __________________ 2013 Sion FRS 2014 Subaru WRX 2014 Subaru XV Last edited by NickFRS; 10-18-2013 at 10:09 PM.

10-22-2013, 09:00 PM	#2
NickFRS Senior Member Join Date: Jun 2012 Drives: 2013 Asphalt FRS Location: Gladstone Posts: 1,450 Thanks: 899 Thanked 440 Times in 286 Posts Mentioned: 75 Post(s) Tagged: 0 Thread(s)	No one??? This really surprises me! I'm highly interested to see if it makes an improvement in power. __________________ 2013 Sion FRS 2014 Subaru WRX 2014 Subaru XV

01-17-2014, 01:27 AM	#3
JW89225 Senior Member Join Date: Jun 2012 Drives: E92 Location: Richmond Posts: 210 Thanks: 239 Thanked 193 Times in 77 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	^Hello OP, I removed the secondary catalytic converter on the front pipe. I retained the small muffler on the front pipe. Sound wise it is pretty much as quiet as stock, but there is a better response or perhaps a slight gain in power around 2500-3000rpm. Everything else is stock, 6AT Cheers! __________________ 2013 Scion FR-S 6AT

01-17-2014, 05:36 PM	#8
NickFRS Senior Member Join Date: Jun 2012 Drives: 2013 Asphalt FRS Location: Gladstone Posts: 1,450 Thanks: 899 Thanked 440 Times in 286 Posts Mentioned: 75 Post(s) Tagged: 0 Thread(s)	O god someone resurrected this? Looks at the other topics. __________________ 2013 Sion FRS 2014 Subaru WRX 2014 Subaru XV

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01-17-2014, 10:24 AM	#4
FRSoxfan Member Join Date: Dec 2012 Drives: 2007 Lotus Exige S Location: Cheyenne, WY Posts: 56 Thanks: 5 Thanked 9 Times in 8 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	OP, I deleted all the cats and installed Borla UEL headers. Kept the stock muffler setup though. Used the Borla overpipe/frontpipe cat delete combo pipe. Let me know if you have any questions! [ame="http://www.youtube.com/watch?v=XYwKFBJjn6A"]IMG 0785 - YouTube[/ame] [ame="http://www.youtube.com/watch?v=2cDD7UpPdrE"]IMG 0784 - YouTube[/ame]

01-17-2014, 11:23 AM	#5
MAPerformance Senior Member Join Date: Aug 2012 Drives: Asphalt FRS Location: Cottage Grove, MN Posts: 1,272 Thanks: 669 Thanked 981 Times in 540 Posts Mentioned: 84 Post(s) Tagged: 3 Thread(s)	Perrin did this a while back, but did not notice any real performance gains on the dyno. I will have to try to dig up his blog post on that.

01-17-2014, 12:27 PM	#6
FRSoxfan Member Join Date: Dec 2012 Drives: 2007 Lotus Exige S Location: Cheyenne, WY Posts: 56 Thanks: 5 Thanked 9 Times in 8 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I'll agree to that, the ol' butt dyno tells me there is def a little more torque in the lower end, got rid of the dip a little. Nothing drastic though, obiviously.

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