Catback advice

Ronin135 · 07-31-2017, 11:39 AM

Hi,

Been looking at a AA catback system for my 135i. My question is after the install do I need to get it tuned, or will I get the benefits as soon as I bolt it on. The site says I'll gain 11.5 hp and 11.5 in torque. But they don't mention tuning. My son just did a catback on his Evo X, his car he has to tune because his catback opens up to 3" at the catback.

Thanks

04mazdaspeed · 07-31-2017, 12:29 PM

No you don't need a tune. I highly doubt you will gain 11hp from a catback though. You already have free flowing mids since n55 so you basically are just changing the axel back. More just for sound than power. Changing the downpipe is where the power lies. Ask your son if he changed the downpipe as well since a tune is not needed for just a catback on any car.

Ronin135 · 08-01-2017, 08:41 AM

Quote:

Originally Posted by 04mazdaspeed

No you don't need a tune. I highly doubt you will gain 11hp from a catback though. You already have free flowing mids since n55 so you basically are just changing the axel back. More just for sound than power. Changing the downpipe is where the power lies. Ask your son if he changed the downpipe as well since a tune is not needed for just a catback on any car.

So if that's the case in just getting better sound, I'd might as well just to the Golf tee mod ? To open that flapper valve back in the muffler?

BimmerAg · 08-01-2017, 02:55 PM

The golf tee mod will give you a little more volume and a deeper tone below 3000 rpm where it would open anyway. If you want your exhaust to be even louder, or want a different tone then aftermarket or BMW PE is the way to go

claasmi · 08-02-2017, 08:09 AM

I first did golf tee mod on my 128i and it makes a slight but noticeable difference in low RPM. PE makes a very big difference across the board and sounds incredible. Can't say I noticed any real difference in power though, but the sound alone kind of makes it feel like you have more power.

jradon · 10-24-2017, 02:25 AM

With just a catback upgrade, I don't think you will get tremendous hp gain.

desertman123 · 10-24-2017, 07:37 AM

The only exhaust mods that should give you real gainz are downpipes and headers for turbo and NA respectively

Ronin135 · 10-29-2017, 12:57 PM

Thanks for the reply's all... decided to do the golf tee mod.

07-31-2017, 11:39 AM	#1
Ronin135 Private First Class 44 Rep 122 Posts Drives: 2012 135i, 6MT, M trim Join Date: Feb 2017 Location: Denver iTrader: (0) Garage List 2015 BMW X4 28i [0.00] 2017 X5 35i [0.00] 2012 BMW 135i M Sport [0.00] 2017 X3 XDrive 28i [0.00]	Catback advice Hi, Been looking at a AA catback system for my 135i. My question is after the install do I need to get it tuned, or will I get the benefits as soon as I bolt it on. The site says I'll gain 11.5 hp and 11.5 in torque. But they don't mention tuning. My son just did a catback on his Evo X, his car he has to tune because his catback opens up to 3" at the catback. Thanks
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07-31-2017, 12:29 PM	#2
04mazdaspeed Private First Class 61 Rep 144 Posts Drives: 2011 135i DCT Join Date: May 2017 Location: Chicago, IL iTrader: (0)	No you don't need a tune. I highly doubt you will gain 11hp from a catback though. You already have free flowing mids since n55 so you basically are just changing the axel back. More just for sound than power. Changing the downpipe is where the power lies. Ask your son if he changed the downpipe as well since a tune is not needed for just a catback on any car. __________________ 2011 135i DCT, 33k miles FBO on custom e30 tune
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08-01-2017, 02:55 PM	#4
BimmerAg Lieutenant 425 Rep 545 Posts Drives: 2011 135i Join Date: May 2017 Location: San Antonio, TX iTrader: (0)	The golf tee mod will give you a little more volume and a deeper tone below 3000 rpm where it would open anyway. If you want your exhaust to be even louder, or want a different tone then aftermarket or BMW PE is the way to go __________________ 2011 BMW 135i ///M-Sport, DCT Bilstein B12 kit, Dinan camber plates, M3 front control arms, Whiteline poly RSFB, MHD Stage 1, cp-e Charge Pipe, H&R Front sway bar, BMW performance diffuser
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08-02-2017, 08:09 AM	#5
claasmi Private 37 Rep 56 Posts Drives: 2011 128i 6MT Join Date: Jun 2015 Location: Toronto iTrader: (0) Garage List 2011 128i [0.00]	I first did golf tee mod on my 128i and it makes a slight but noticeable difference in low RPM. PE makes a very big difference across the board and sounds incredible. Can't say I noticed any real difference in power though, but the sound alone kind of makes it feel like you have more power.
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10-24-2017, 02:25 AM	#6
jradon Private 18 Rep 90 Posts Drives: 2series Join Date: Mar 2015 Location: SC iTrader: (0)	With just a catback upgrade, I don't think you will get tremendous hp gain.
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10-24-2017, 07:37 AM	#7
desertman123 E82 Mudflap Ambassador 2214 Rep 2,219 Posts Drives: '08 128i Join Date: May 2016 Location: Orlando, FL iTrader: (0) Garage List 1992 Honda Beat [9.50] 2008 BMW 128i [10.00] 2014 BMW 528i [10.00]	The only exhaust mods that should give you real gainz are downpipes and headers for turbo and NA respectively __________________ My 2008 128i - Sparkling Graphite/Beige - Sport pkg - 6MT - Click me! Parents' 2014 528i - Mineral White/Ivory White - fully loaded Instagram @Andreys_128i and @Honda.Bito
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10-29-2017, 12:57 PM	#8
Ronin135 Private First Class 44 Rep 122 Posts Drives: 2012 135i, 6MT, M trim Join Date: Feb 2017 Location: Denver iTrader: (0) Garage List 2015 BMW X4 28i [0.00] 2017 X5 35i [0.00] 2012 BMW 135i M Sport [0.00] 2017 X3 XDrive 28i [0.00]	Thanks for the reply's all... decided to do the golf tee mod.
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