Fact vs Fiction: Catless front pipe (no tune) - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

BlueDubbinTDI · 11-03-2013, 10:05 AM

Can somebody please tell me when is truth and what isn't when it comes to going catless front pipe, NA, tuneless?

General weight difference in piping
WHP loss or gain
MPG loss or gain
Smell
Drone
Rasp
Noise increase
Dyno graphs

Everything covered, for use by others as well, please

xsuperbeex · 11-04-2013, 12:34 AM

depend on your cat back, header and overpipe

SmsAlSuwaidi · 11-04-2013, 12:41 AM

Quote:

Originally Posted by BlueDubbinTDI

Can somebody please tell me when is truth and what isn't when it comes to going catless front pipe, NA, tuneless?

General weight difference in piping
WHP loss or gain
MPG loss or gain
Smell
Drone
Rasp
Noise increase
Dyno graphs

Everything covered, for use by others as well, please

Not a lot
1 hp or so
dont know
more fumes
cats usually dont affect drone but a slight increase
More rasp
More noise
dont have

CSG David · 11-04-2013, 12:43 AM

Quote:

Originally Posted by BlueDubbinTDI

Can somebody please tell me when is truth and what isn't when it comes to going catless front pipe, NA, tuneless?

General weight difference in piping
WHP loss or gain
MPG loss or gain
Smell
Drone
Rasp
Noise increase
Dyno graphs

Everything covered, for use by others as well, please

Your secondary cat isn't monitored. Less weight, slightly more tone, but barely noticeable. Little to no gain on dyno graphs, but slight increase in throttle response. The benefit is less restriction and lower weight which will actually help with future mods when you tune.

Anthony · 11-04-2013, 12:46 AM

Quote:

Originally Posted by SmsAlSuwaidi

Not a lot
1 hp or so
dont know
more fumes
cats usually dont affect drone but a slight increase
More rasp
More noise
dont have

I agree with all of this, except for the first part, only because it depends on what you consider "a lot," which will vary person to person. You can save up to 10 pounds with a front pipe by switching to Amuse, for about $1,000. Or 9.1 pounds by switching to Tomei for about $350.

Lightest Exhaust, Headers, and Front/Over/Mid Pipes?

SmsAlSuwaidi · 11-04-2013, 12:48 AM

Quote:

Originally Posted by Anthony

I agree with all of this, except for the first part, only because it depends on what you consider "a lot" which will vary person to person. You can save up to 10 pounds with a front pipe by switching to Amuse, for about $1,000. Or 9.1 pounds by switching to Tomei for about $350.

Lightest Exhaust, Headers, and Front/Over/Mid Pipes?

switching front pipes does make a difference, the difference between a catted and an un catted one is minimal.

Anthony · 11-04-2013, 12:49 AM

Oh yeah, definitely.

pche · 11-04-2013, 11:11 PM

I have catted P&L EL header(GREAT company to deal with) Perrin overpipe, catted Perrin front pipe, stock midpipe, Nameless axle back with 5" mufflers. Maybe I'm just getting too old but I think it's too loud... And it does drone, a lot. From my research, this is suppose to be one of the quietest combination, but it is loud, boarder line obnoxious. I don't regret it due to the power gain, but I do wish it was quieter.

11-03-2013, 10:05 AM	#1
BlueDubbinTDI Senior Member Join Date: Mar 2013 Drives: 2013 FR-S, 2012 MCS Location: Jax, FL Posts: 1,975 Thanks: 943 Thanked 570 Times in 356 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Fact vs Fiction: Catless front pipe (no tune) Can somebody please tell me when is truth and what isn't when it comes to going catless front pipe, NA, tuneless? General weight difference in piping WHP loss or gain MPG loss or gain Smell Drone Rasp Noise increase Dyno graphs Everything covered, for use by others as well, please

11-04-2013, 12:49 AM	#7
Anthony Weight Nazi Join Date: Aug 2012 Drives: 13 FRS -399lb, 11 335is, 05 Tiburon Location: Biloxi, MS / Gulf Coast 86 Posts: 3,702 Thanks: 5,009 Thanked 3,714 Times in 1,765 Posts Mentioned: 150 Post(s) Tagged: 4 Thread(s)	Oh yeah, definitely. __________________ Build Thread \| The Venus Project \| Any car which holds together for a whole race is too heavy.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
PTUNING Weekly Special: Invidia Catless Front-pipe / Test pipe $229 INSTALLED!	Patrick@Ptuning	Engine, Exhaust, Bolt-Ons	3	10-01-2013 04:16 PM
WTB: catless front pipe	Kai Uhl	Want-To-Buy Requests	0	09-07-2013 02:51 AM
Spring Sag? Fact or Fiction.	theom	Suspension \| Chassis \| Brakes -- Sponsored by 949 Racing	18	06-25-2013 01:18 AM
Track pipe + catless front pipe	diss7	Engine, Exhaust, Transmission	21	10-09-2012 02:10 AM
fact or fiction on this performance and tuning guide?	davey90	AUSTRALIA	10	07-19-2012 08:45 PM

11-04-2013, 12:34 AM	#2
xsuperbeex Member Join Date: Jul 2013 Drives: Toyota Galaxy Blue Silica 86 Location: Indonesia Posts: 76 Thanks: 5 Thanked 20 Times in 18 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	depend on your cat back, header and overpipe

11-04-2013, 11:11 PM	#8
pche Guy on internet Join Date: Jun 2013 Drives: Slowly Location: PA Posts: 582 Thanks: 1,407 Thanked 492 Times in 233 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	I have catted P&L EL header(GREAT company to deal with) Perrin overpipe, catted Perrin front pipe, stock midpipe, Nameless axle back with 5" mufflers. Maybe I'm just getting too old but I think it's too loud... And it does drone, a lot. From my research, this is suppose to be one of the quietest combination, but it is loud, boarder line obnoxious. I don't regret it due to the power gain, but I do wish it was quieter.

User Name		Remember Me?
Password